Apologies for your wait.
Firstly, while this could be a hard drive issue, it could also be a power supply issue instead.
If you have access to another computer, your best bet may be to test the drive on that computer. This should confirm whether the drive itself is the problem but if it's not, it will also give you the chance to backup the data thats on it.
NB. if you do manage to talk someone into letting you use their pc, I strongly recommend that you first ensure their antivirus & anti malware software is up to date, and then once your drive is connected, run a full scan over it.
If the drive behaves itself on a different computer, then you may want to look at your PSU being the potential culprit.
If you don't have access to another pc, then you could try booting in safe mode to see if that helps. This may prove successful if the reboots are being caused by software but it could also indicate an underrated PSU.
If you don't already know how to boot into safe mode, then the easiest way is to boot normally, go to start -> run -> and type msconfig
Click on the boot.ini tab then select the SAFE BOOT option (minimal). Click OK & reboot the system to start in safe mode. Be aware that the system will continue to boot in safe mode every time until you clear the SAFE BOOT checkbox in msconfig.
Edited by Samm, 04 December 2007 - 05:33 PM.