My task manager has been disabled, I have tried to enabled it by doing the gpedit.exe thing, but it didn't help.
This is my personal computer that isn't on a domain, so it can't be a domain policy thing.
My OS is windows 7 Pro 64Bit
It is happening on my Laptop Win 7 64Bit as well, so I might be a Virus or a glitch in a program I installed that has caused it. I try keep my desktop and laptop, similar to each other with the software I install on it. But I hasn't happen on my 32bit laptop, but I haven't been keeping that one up with the stuff I install on it.
You may be right it may be a virus. I normaly scan and clean up after a virus using 3 free tools.
1) Download install and scan with malwarebytes.
2) Use the windows live safety scaner.
3) Update and run your virus protection (Microsoft Security Essential is free)