Enabling regedit (registry editor) disabled by virus/worm in Windows XP

Sometimes, virus or worm disables registry editor, so users can not open registry editor when they are in need to change some values in it. Usually registry editor is opened when users click Start-Run and type 'regedit', when it is disabled, a pop up message appears saying that registry editor is disabled by Administrator.

To solve this problem follow these following procedures:

1. Click Start-Run and type 'cmd' or Start-All Programs-Accessories-Command Prompt.
2. Type this following command: reg delete HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableRegistryTools
3. Press ENTER 
4. When question 'Delete the registry value DisableRegistryTools (Yes/No)?' appears, press 'Y'

After following this steps, registry editor will be re-enabled. Usually virus/worm is the source of this problem, so it will be better to follow these steps after removing virus/worm in infected PC.
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