Sounds like there's more wrong than just the hard drive. If memtest freezes, even after that long, there is something wrong. Try Hirens boot disk and see if it will load:http://www.hiren.info/pages/bootcd
Okay, I'll try Hirens, but these ISO files are a pain in the ***, I'm starting to wonder if they are the problem...? (I'm using CDBurnerXP and Sony disks). I'll post an update tonight, it will probably take awhile to download with our crappy Verizon internet connection here.