Registry Editing has been disabled by your administrator

Method 1: Using the REG.EXE console tool

1. Click Start, Run and type this command:
 
REG add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableRegistryTools /t REG_DWORD /d 0 /f

Method 2: Using the Group Policy Editor (Windows XP Professional only)

  Click Start, Run and type gpedit.msc and press ENTER
  Go to the following location:

  User Configuration | Administrative Templates | System
  Double-click Disable registry editing tools and set it to Not Configured
  Exit the Group Policy Editor

Note: If the setting already reads Not Configured, set it to Enabled, and click Apply. Then revert it back to Not Configured. This ensures that the DisableRegistryTools registry value is removed successfully.