I decided to crank this thing off with computer advice. While your computer is still running:

1. Make sure your system boots from the CD first (in CMOS or Setup)
2. Go to http://www.ubcd4win.com/downloads.htm and download the program.
3. READ THE INSTRUCTIONS!
4. Burn the CD from the ISO file.
5. Boot from the CD. (It takes a while 'cause it's a CD)
6. After the system has completed loading, go to the command prompt.
7. Run "chkdsk C: /f".
8. Remove the CD and attempt to restart the system.

If it still doesn't start, seek professional help if you value your data. If you don't care about your data, reinstall your operating system.

Keep in mind that there is no such thing as a bulletproof System. Normally it's not the O/S that's bad. It's the crappy software that gets installed on the system.