i have an unusual problem. i bought a hp desktop dc5800 sff on ebay. when i got the pc i hooked it up and turned it on.windows 7 pro starts loading but is password protected and i can't get a response back from the seller. its been 3 days. how can i reinstall windows to get around this. i have a new windows cd but the desktop won't read the disc on reboot, it just keeps trying to load the 7 pro and asking me for the password.
