Registry editing has been disabled by your administrator

2 methods to enable registry editing. Choice is yours or you might be forced.

1st Method

1. Click Start > Run and type gpedit.msc
2. Navigate to User Configuration > Administrative Templates > System
3. Double click Prevent access to registry editing tools
4. If it's Not Configured then Enable it and Disable it. If already Enabled then just Disable it.
5. Now try regedit.exe

2nd Method

1. Click Start > Run and type in
   REG add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableRegistryTools /t REG_DWORD /d 0 /f
2. Now try regedit.exe

Note: You might have to restart the computer for changes to take effect.