try this to see what may be going on.
Windows Key+R
then gimp-2.6.exe -c --verbose

You should see error messages with gimp started.

If you are using a tablet then as gimp is launching and see the splash screen make sure the cursor is over the splash screen during the whole startup process or else it will appear that nothing is working when you trying to do something with the tools.

I have a feeling this has to do with GTK being blocked/or not found in the path.
Because Gimp is loading but nothing works.

THIS WILL ONLY WORK IF YOU HAVE ADMIN RIGHTS -
Try this - look in Start/Control Panel/System - click the advanced tab - click environment variables - look for a Variable named GTK_HOME in system variables listing.
If it is there make sure the path to GTK include is at the very end - Edit - look for this line or add this line - ;C:\Program Files\GTK2-Runtime\bin
make sure to add it with the semicolon IF the semi colon isn't present at the end of the variable list.

IF the variable GTK_HOME isn't listed create it select NEW -
variable - GTK_HOME
value - ;C:\Program Files\GTK2-Runtime\bin - click ok, ok again and ok again -

Restart your computer (this will make sure windows see's the new settings), and try to run Gimp again.

if the tools are no working some error should pop out, at least after opening a image and trying to use a tool

You may just copy the console output and post

BTW if Ctrl-C doesn't work to copy from the console try Shift-Ctrl-C

INIT: gimp_load_config
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\unitrc'
Parsing 'C:\Program Files\GIMP-2.0\etc\gimp\2.0\gimprc'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\gimprc'
gimp_composite: use=yes, verbose=no
Processor instruction sets: +mmx +sse +sse2 -3dnow -altivec -vis
Adding theme 'Default' (C:\Program Files\GIMP-2.0\share\gimp\2.0\themes\Default)

Adding theme 'Small' (C:\Program Files\GIMP-2.0\share\gimp\2.0\themes\Small)
Writing 'C:\Documents and Settings\Debbie\.gimp-2.6\themerc'
Trying splash 'C:\Documents and Settings\Debbie\.gimp-2.6\gimp-splash.png' ... f
ailed
Trying splash 'C:\Program Files\GIMP-2.0\share\gimp\2.0\images\gimp-splash.png'
... OK
INIT: gimp_initialize
INIT: gimp_real_initialize
INIT: gui_initialize_after_callback
INIT: gimp_restore
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\parasiterc'
Loading 'brush factory' data
Loading 'pattern factory' data
Loading 'palette factory' data
Loading 'gradient factory' data
Loading fonts
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\templaterc'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\modulerc'
INIT: gui_restore_callback
clipboard: writable pixbuf format: image/png
clipboard: writable pixbuf format: image/bmp
clipboard: writable pixbuf format: image/x-bmp
clipboard: writable pixbuf format: image/x-MS-bmp
clipboard: writable pixbuf format: image/tiff
clipboard: writable pixbuf format: image/gif
clipboard: writable pixbuf format: image/jpeg
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\sessionrc'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\dockrc'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\toolrc'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\contextrc'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-rect-selec
t-tool'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-rect-selec
t-tool.presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-ellipse-se
lect-tool'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-ellipse-se
lect-tool.presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-free-selec
t-tool'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-free-selec
t-tool.presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-fuzzy-sele
ct-tool'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-fuzzy-sele
ct-tool.presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-by-color-s
elect-tool'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-by-color-s
elect-tool.presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-iscissors-
tool'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-iscissors-
tool.presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-foreground
-select-tool'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-foreground
-select-tool.presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-vector-too
l'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-vector-too
l.presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-color-pick
er-tool'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-color-pick
er-tool.presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-zoom-tool'

Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-zoom-tool.
presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-measure-to
ol'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-measure-to
ol.presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-move-tool'

Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-move-tool.
presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-align-tool
'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-align-tool
.presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-crop-tool'

Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-crop-tool.
presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-rotate-too
l'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-rotate-too
l.presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-scale-tool
'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-scale-tool
.presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-shear-tool
'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-shear-tool
.presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-perspectiv
e-tool'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-perspectiv
e-tool.presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-flip-tool'

Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-flip-tool.
presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-text-tool'

Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-text-tool.
presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-bucket-fil
l-tool'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-bucket-fil
l-tool.presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-blend-tool
'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-blend-tool
.presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-pencil-too
l'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-pencil-too
l.presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-paintbrush
-tool'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-paintbrush
-tool.presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-eraser-too
l'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-eraser-too
l.presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-airbrush-t
ool'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-airbrush-t
ool.presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-ink-tool'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-ink-tool.p
resets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-clone-tool
'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-clone-tool
.presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-heal-tool'

Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-heal-tool.
presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-perspectiv
e-clone-tool'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-perspectiv
e-clone-tool.presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-convolve-t
ool'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-convolve-t
ool.presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-smudge-too
l'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-smudge-too
l.presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-dodge-burn
-tool'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-dodge-burn
-tool.presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-desaturate
-tool'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-desaturate
-tool.presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-color-bala
nce-tool'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-color-bala
nce-tool.presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-hue-satura
tion-tool'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-hue-satura
tion-tool.presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-colorize-t
ool'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-colorize-t
ool.presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-brightness
-contrast-tool'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-brightness
-contrast-tool.presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-threshold-
tool'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-threshold-
tool.presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-levels-too
l'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-levels-too
l.presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-curves-too
l'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-curves-too
l.presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-posterize-
tool'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-posterize-
tool.presets'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-gegl-tool'

Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\tool-options\gimp-gegl-tool.
presets'
INIT: gimp_real_restore
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\pluginrc'
Starting extension: 'extension-script-fu'
INIT: gui_restore_after_callback
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\menurc'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\devicerc'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\controllerrc'
Parsing 'C:\Documents and Settings\Debbie\.gimp-2.6\colorrc'
loading menu 'C:\Program Files\GIMP-2.0\share\gimp\2.0\menus\image-menu.xml' for
/image-menubar

What gives?