Non Recognized iPod and Disk Write Errors...

[ElixirIce]

Hey everyone! Hoping someone can help me... this is the breakdown:

Bought a 15GB iPod a month ago. Used to work perfectly with iTunes. Now it is somewhat not recognized by my PC. It does not show up as another hard drive on the "My Computer" screen, but sometimes when it is plugged in it will tell me that the updated software is on on it and then the software updater will show up and it will only have the restore option available-click on restore and it only goes about 65% before stopping and saying there is a disk write error. Took it to the apple store and they wiped it clean a few times and told me to plug it back in the computer and restore it and it should be fine but if not bring it back and they'll replace the hard disk-but it didn't work again so i brought i back again and they plugged it into their computers and it works fine, so appararently my computer is ######ed. I tried to install the device manually and I went on the apple support website and tried to reformat the iPod as it directed but none of that works. Plugged it into another USB port and it is still not recognized.

Any ideas are VERY much appreciated...
Thanks in advance!