You mean that typing both gpedit.msc and regedit.exe in the start>run box give this error message?
What happens if you locate them with Windows Explorer and run from there by doubleclick?
I keep being told to run 'gpedit.msc' or 'Regedit.exe' in order to fix the disabling of my Windows XP Home Edition task manager. However when I do this I get the message, 'Windows cannot find...' Please advise me of the right file to put in here. Thanks