A couple of days ago something odd happened to my Vista ultimate setup:
1) I discovered that I could nolonger access task manager - "this operation has been cancelled due to restrictions in effect on this computer."
2) I could nolonger access registry editor - (see above message).
3) The power button was nolonger on the start menu, and when I try to shut down using the alt + f4 command I'm presented with the same message (see above message).
Now I've managed to claw back access to task manager and regedit using some scripts I found on websites but i've been unable to restore the power button to the start menu.
I've tried to go into group policy editor - gpedit.msc and enable the start meny power button to no avail - it makes no difference.
I've done countless virus and spyware checks with different programs and nothing has come up. :
My PC doesn't seem to be operating any less effectively.
Temporarily I've created shortcuts to shut down, hibernate and restart my PC but I'd really like the button on the start menu back.