well I got two problems

1- My hard drive begins to make weird noises. While it does this, the whole system freezes and crashes, including the keyboard and mouse. The noise resembles the same swishy noise a CD drive makes while trying to read a bad CD.
I have to restart the whole thing.

2- Yesterday my hard drive just failed and died in the middle of something, it didnt even make a weird noise, it just shut off and restarted the whole system.
Because of that, system files were damaged. Fortunatelly, I managed to fix that with the recovery console. Unfortunatelly, I think other files were damaged and are undetectable by registry fixers and anti virus programs. My videos and DVDs dont work!!
The weirdest thing is that all sound works, all 3d applications work, but everytime I try to watch a video clip or a DVD, it crashes and restarts the whole thing instantly.
Something to do with the codecs? Damaged hard drive?

Please help ???