Error Message: "Registry editing has been disabled by your administrator"

When you attempt to start the Registry Editor (regedit.exe) in your Windows Vista system, you may receive the following message:

Solution - Using Group Policy Editor

=> Start > Run > gpedit.msc=> then nevigate the following path (in left pane)
User Configuration | Administrative Templates | System
=>  Double-click Prevent access to registry editing tools
     Set it as "Disabled" or "Not Configured"