Right, I have had issues here, check this out tho.
Ctrl Alt and Delete, no task manager, right click the taskbar, no task manager.
So ok, go online and find a regfix, type regedit, and REGEDIT is disabled!!
Now, I dont know what is going on here, all I know is this. . . .
Its happened on my home pc, a XP pc that diddnt go online, another Vista machine that has NEVER gone online. Its not a piece of software, me thinks something is going on.