Disabled task manager

try selecting the run option under the start menu. type in "gpedit.msc" and go to User Configuration, then Administrative Templates, next System, and next Ctrl+Alt+Deleve Options. Choose Remove Task Manager and double click the Remove Task Manager option. Disable this, and restart the computer. a shortcut for the task manager is Ctrl+Shift+Esc.

It is a virus, you can fix it in two ways .

1.) you can download AVG free antivirus
and Super anti spyware both are free programs
update them and run them.. use google to find them..

2.) you can restore your computer to a previous date,
one which it was working
Click Start / all programs / acessories / system tools / system restore

Cheers