Sounds like a boot record issue.

by R. Proffitt Moderator - 11/5/12 10:16 AM

In Reply to: Dell Studio XPS 9000 will not boot by dkcobbs

And such is NEVER fixed if the owner has yet to backup what's on said drives. But once they are sure their files are safe I'd look at booting a Windows 7 DVD and using the usual boot repair commands. I have used EasyBCD (see google about that as there are tutorials I don't duplicate here) but what's very important is that the files are safe first.
Bob