Windows 7 - Windows in reboot cycle.

Posted this in general, then realized it's probably better to ask here.

Daughter was on her usual morning video skype with her boyfriends in the middle east, when according to her, it said something about a problem with internet explorer "she thinks", then it did a forced shut down.
Since then it shuts down and reboots every time it gets to the part just past the splash screen, where the mouse shows up.
Doesn’t say shutting down or anything, just the thump of the subwoofer having it’s signal removed and the monitors note that the computers off and it’s going to sleep. Then it boots again.
FYI: Windows 7 /Pentium 4 3.0/1 g ram/with 2 1T drives, one with the current setup, and the other with the original XP system that I migrated from in December.
I’ve tried the auto repair options by booting from the Windows 7 disk. I’ve run several virus and the diagnostics from WD for the drive, but found nothing. Even tried abootsect /nt60 from the disk.
I’ve tried booting into safe mode in just about any configuration with the same shut down as a regular start up. Since I can’t start the system, Windows 7 won’t let me reload the OS. Really don’t want to use the custom option as I really don’t want to nuke everything if I don’t have to. Especially because, if I don’t find the problem, I can’t be sure what happened, or that it won’t occur again. I don’t believe it’s a hardware issue, because I never wiped the old XP system and left it as a second drive in the system.
If I boot from that drive, everything loads and runs fine.
Looking from XP, I seem to have full access to the other drive with no issues as afar as I can tell with the drive (who knows though).
I’m finding it’s much harder to diagnose an issue when you can’t even boot the system.
Really wish I had made an emergency boot disk for this system.
Thank,
Kevin R

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Why don't you boot into XP , copy your files to the working drive then back again to Format the other ?!!
it won't take one hour for installing Windows 7
Just be careful when browsing the web and talking with strangers :P

That may be my only option, but hoping to save reloading all the programs etc.
The drive has a c and d partition, with data on the d.
My first try (stuff backed up just incase) would be to reload windows 7 on the c drive, hoping to just tie it back into the data on d. Any idea if this will work?
Problem may come up if I get forced to reformat the whole drive.