Windows 7 Won't Start On Dell Latitude D610

The Dell I have I bought used off of eBay so I do not have any of the discs. When I turn it on this morning, it has the screen, "windows failed to start....". There was no recent hardware or software change. when I try to run launch start up repair it gives me this message. The system cannot find the path specified. (0x80070003) <clicked ok> start up repair cannot repair this computer automatically either>>>detail, Start up Reapri Offline. To use System Restore, you must specify which windows installation to restore. Windows cannot check for memory problems. When try to just select Start Windows Normally, it begins and when it gets to the glowing Windows 7 Logo, it freezes with the 4 glowing windows boxes. When I hit F12 and try to go into safemode, it shows a huge list of drivers and then just freezes. I was on something else that I now can't remember and it said "no diagnostic utility partition found." Like I said, I don'thave a CD for this computer.