I've been running Windows 7 for a week and had no problem at all until this morning, when I added a networked printer (HP photosmart) and installed Bullzip PDF printer. Shortly afterward Windows started crashing, then blue-screened with a memory dump. Now it won't boot into Windows 7 at all. Even in safe mode it starts to boot, then flashes a blue screen error (so quickly I can't read it) and restarts. Anybody else had problems with either a network printer or a virtual printer driver?