Did I frag my windows install?

[Penguinus]

I was attempting to fix a problem with windows not cooperating with my USB 2.0 ports, so I driver cleaned my NForce drivers install and then i reinstalled them. As I was rebooting windows, I got a message saying that Windows could not boot. I tried all the options (safe mode, last known good config, etc.) to no avail. I have no idea what happened -

anything I should try before I have to call it quits and reinstall windows?