Fix Regedit Disabled.

START | RUN and in the run box type CMD and press Enter.

Type the following line (REG DELETE...) into the command window and press enter - you will be prompted as to whether you wish to delete it ...
do so.
If the value does not exists then you will get the error "The system was unable to find the specified registry key or value"


REG DELETE HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\
System /v DisableRegistryTools

If that was not there then try the following from the command prompt:

REG DELETE HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\
System /v DisableRegistryTools