|In direct answer to your subject line:|
Download PsTools from here:
The file you want (inside zip) is 'psexec.exe'
I put mine in a sub-folder 'C:\Program Files\PsExec' and start it with the following batch file (in the same folder):
Start "" "c:\Program Files\PsExec\psexec" -i -d -s c:\windows\regedit.exe
For future convenience make a shortcut to the batch file (I called mine 'Regedit Unrestricted'). This will produce the usual regedit screen but allows you to remove or change locked entries.
What's the time?