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You have a corrupt profile, you will need to login as another user.
Rename old profile folder and in registry; then you'll be able to login as normal again.
Instructions here, or we can do a remote session and I can do this for you: http://www.pcadvisor.co.uk/how-to/windows/how-fix-corrupt-user-profile-in-windows-7-3495216/
Checking in, do you need help with anything else?