Windows 7 - frozen during "starting windows" DISK.SYS/CLASSPNP.SYS
after much hardship i found my answer. i have a hp 2000 note book pc and the problem was the legacy boot up option in bios being disabled. i enabled it and it booted up just fine and am installing windows 7 u right now. will update
Well after much brain racking I finally figured it out. There's something wrong with the motherboard's onboard firewire. When I disabled it in the bios the system ran fine again. Thanks to everyone for the suggestions, but it seems it was a hardware problem in the end.