See Tip 275 in MVP Kelly's site:
Lift Restrictions - TM, Regedit and CMD
http://www.kellys-korner-xp.com/xp_tweaks.htm
If any problem there the manual setting is here:
Go to your Start>Run and type the following exactly between and without the
Quotes ("")
"REG DELETE HKCU\Software\Microsoft\Windows\CurrentVersion\Pol icies\System
/v DisableRegistryTools"
and/or
"REG DELETE HKLM\Software\Microsoft\Windows\CurrentVersion\Pol icies\System
/v DisableRegistryTools"
This behavior is usually changed by a virus. That being said you might want to run a HijackThis log by our Pros in that section.
Please follow the instructions
HERE & then post your log in a new thread in the
Spyware, Adware, Viruses and HijackThis Logs section.
(
Not in this section please).
Please specify what issues you appear to be experiencing along with your log.