WIN 7 Pro and Virtual XP, password.

I installed virtual XP and i worked fine, installed some XP-programs, still OK.
During installation of Adobe Premiere which took long time I also changed my XP-password. PROBLEM.

I can not open the Virtual XP any longer, nor with the new or the old password, I have tried to remove Virtual XP and reinstall several times, but still same problem appears.
When reinstalling I don´t get the setup screen so there must be some info left from the first set-up.

Must be a way to get rid of Virtual XP totally so I can start from the beginning or is there a way to remove the log-in sign and pass through?

Thanks for your answer, i did fix it by backing up the system two days and then removing the update file plus all maps where I could find VR-machine, after 24 hours of work I was back to "BASIC" and did a new intallation, it´s now running OK. Tu.