Log on with another administrator profile. Execute regedit Goto Local Machine\Software\Microsoft\Windows NT\Profile List Go through the profiles to find yours. You can use the ProfileImagePath to identify your profile The key to your profile may have a ".bak" appended to it. There will be another identical key except for the bak. Rename this key and rename yours removing the ".bak" Change the State property to 0.
Log off and retry logging on with your profile. It should now work.