Dell C521 Will not boot

Actually you need Startup Repair if WIn7 won't start.

Make sure the Win7 or it's 100mb System Reserved boot partition is marked Active first: Partition - Mark as Active (Method Two)

If there's a driver that's blocking it from starting it might also be remedied by plugging the HD in and booting into Paragon Adaptive Restore CD to run P2P Adjust on the OS to adjust it to boot on any hardware.

Well, i had to re install Windows 7, which isnt a big deal for me, but now when i try to enter the name of my pc, it wont recognize my mouse or keyboard, i have tried several, and even different USB ports.

i have, its been sitting for 10 minutes at least.

It works in BIOS.

ok, will check

Wait, it works now, i may run into the CLASSPNP.SYS problem again, because Startup Repair did NOT fix it.

Will keep you posted.