Well, if nothing works, and you are interested in a faster harddrive, instead of RAID 0, I would recommend a simple SSD. They are a bit more expensive, but the speed is tremendous. You can get a good one for less than 180USD. You might consider a 80 - 120 GB SSD, and put all files, such as documents, MP3s, videos, etc. onto a second standard harddrive. That way, the OS and any game, app, etc. that you need to go really fast will. If your motherboard supports 6 Gbit/s, you can get a 6 Gbit/s SSD which will make loading times take even less time.
RAID 0 sets up two similar harddrives for increased performance, but may cause problems if even one of them fails. And having two harddrives increases that chance that one of them will fail (2 have a higher chance than 1). If you want more info on RAID levels, read this: Standard RAID levels - Wikipedia, the free encyclopedia
- this can let you know how you might set up RAID according to your needs. I would choose an SSD over a HDD RAID setup, as you will get the speed without complication.
Let me know and I'll make suggestions. Sorry that your harddrive is having so many problems. If you need to save data off it, please refer back to Gregrocker's tutorial at the end. That will tell you how it can be accomplished.