please restart the computer and tap down the F8 key until the 'Windows Advanced Options' menu comes up, select 'Safe Mode' ...when the logon screen comes up, is there a Administrator account present?
logon to the Administrator account, go to Start > Run, and type in control userpasswords2 in the dialog box that comes up. In the 'User Accounts' window that comes up, highlight your own user account and click the 'Reset Password' option at bottom, leave both of the password XXXXX blank when prompted and click 'Ok'. Restart your system normally now and check if you can login to your account all right thereafter.
I will opt out as i am out of idea however other experts here may help.
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i wish i was a mac expert that could tell you if it is even possible to run windows in safe mode on a mac. i can ask a friend tomorow.
but yes for sure you can reinstall windows. when it prompts you for a user id and a password XXXXX leave the password XXXXX blank.
probably be easier all around as you haven actually done anything with it why spend a lot of time trying stuff to get in. just reinstall it with no password leave it blank. make a NEW user name though just in case it wont overide the password XXXXX thinks it has for the old one