I tried to enable the Task Manager

Hi all

I tried to enable the Task Manager if it was put out of action but I got that when I tried to do it, my Registry Edit was also disabled.

I recognize this is most likely due to a virus; however I scanned my PC many times with McAfee Antivirus 2010 but found nothing. 

But, I'm having problem to enable the regedit. Also I attempted every way listed but I continue getting error messages. This is the major one:

Windows Script Host

Script:                 C:\Users\Edin\Destop\reg_enable.vbs
Line:                   22
Char:                   2
Error:                   Invalid root in registry key
"HKEY_USERS\S-1-5-21-3342531627-3480793956-2812775554-1000\Soft
ware\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegis
tryTools".
Code:                  80070005
Source:                WshShell.RegDelete

                                                                      OK

What should I do now? Please help me to solve it.

Thanks a lot.