Help me if I misunderstood your post: You can see the login screen and when you enter your password correctly it does not log you in correct?
If this is the case, then I think the matter should not be with your graphics card.
If you can't solve your problem, boot your system from CD/DVD and go with the system check. The program will check all your system and make necessary "corrections" where needed. You will not need a reinstall.
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