Hard drive won't format or delete in XP install

Hi, I just put together a desktop with an Asus A7V880 mobo and after I installed XP on my Seagate SATA Baracuda 7200.1 120Gb harddrive I was running windows and it shutdown and said it had to shutdown to protect my computer and now I think there is some corrupt data onit that will not delete off the hard drive.I have tried many many differe nt things to delete the drive so I can reinstall windows onit.It shows up in my computer in the bios but not in windows windows and will not format either.I just bought a seagate 40Gb hardrive just like it for the computer also I have installed windows onit and it runs good ,but it sometimes tells me it has to studown to protect computer to but it will still reboot.I have ran Seatools on the hard drive and it finds errors on the drive and ask me if I want to repair them and I do and it shows them as repaired.It says passed after repair right,then I try to rescan it again to see if it fixed them ,but it the errors still show up again just like the first seatools scan.I have just about ran out of options on how to delete the hard drive any help would be much appciated.Thanks ,Brandon

if you have the Acronis disk it has HDD tools that may recover bad sectors if that's the problem, have you tried to restore the computer to a earlier time to see if you have corrupt files or if the Hdd is bad