OK, done something really stupid!
I wanted to restrict what standard users can access and used gpedit.msc User_Config/Admin Templates/System to prevent "Users" from using command prompt and restricting them to only be able to use certain programmes Adobe and IExplorer as a staring point.
Only trouble is, the User that has Admin rights is also restricted so now I can't makes further changes or even undo what I've done, I ALWAYS get the message "This operation has been cancelled due to restrictions on this computer. Contact your sys admin."
I didn't enable the master Admin account beforehand!
Am I fubared or is there away to recover?