Link_of_Hyrule, on 24 October 2012 - 03:12, said:
Ok I found out how to fix this problem! If you delete the whole C:\ProgramData\Microsoft\Windows\SystemData folder than it will let you set your lock screen once again! Anyways hope this helps you out!
Where did you get the information for solving this problem? I have the same issue and I don't want to mess with any system files if it won't work.