..sending out warnings on your computer screens?
I had a window pop up on mine...covering the whole screen and I couldn't get rid of it either. Said that hackers were about/compromising (something to that effect - what's new) And if I closed the window before ringing a certain phone number they would disable my computer?!
Well after a couple of force closes and opening up my computer and deleting the last couple things in my history I was able to open without it popping up. Anti virus scan did nothing and since windows ten has updated I cannot use cc any more

No; Microsoft doesn't do this kind of warning. Maybe your anti-virus did the popup, but I doubt even that does this. If it tells you to click here, don't. Power down your PC. If it still does this, then it's likely you received a drive by or inadvertently clicked on a link that has gotten your PC infected. Hate to be the barer of bad news, sallyanne. I trust no anti-virus/malware program. That's why I virtualize my entire OS so I can recover from a golden set point (takes about 10 seconds) should I even get the whim that my system's infected. I store files outside my VM. Anyway, such attacks (hijacks) can be hard if not down right onerous to remove. Best to back all of your data and, if you know how, re-build your OS since I no longer believe a virus removal is good enough any longer.

No this is a company trying to get you to let them access your computer via remote. NEVER trust this kind of popup.I hear you about Cleaner also. It won't work on my Windows 10 either.

Best thing for you to do is a "SYSTEM RESTORE" .

Indeed, I agree with Rod; try a restore first. If no dice, then re-install.

I might revert back to Win7. When I was in the control panel this afternoon I saw some thing that said I could.
Thanks for your replies. It looked a bit sus

No problem. Good luck with everything.
If i am correct you can restore back to Windows 10 before the last update. Of course you will have to update again or Windows will keep bugging you to.

You could always try Linux. Linux Mint is Newbie friendly.

What AV you use? It is up to date?
From the description the behavior seem to be similar to some ramsonware virus (i.e. the Tech-Support-Scam or the Microsoft help desk scam).

My C Cleaner stopped after the update also but you just need to install the latest version. It works now.
I also use AdwCleaner, it was recently bought by Malwarebytes.
A few links to them adwcleaner ccleaner