I recently installed Windows 7 Ultimate. I then downloaded the Virtual PC and Windows XP mode. Both installed successfully. I have been using it for a couple of days and I must of done something because now when I try to log into XP mode in the virtual PC I have the ctrl-alt-del window. When I do this It just takes me back to my windows 7 login screen asking to switch user, logoff, etc. How do I log back into my xp mode?