It is a hardware problem concerning your hard drive.
There are two main causes - either a boot sector virus or system inability to read from the page file on your hdd. You can easily find out which one that is by running an antivirus test.
In case it is not a boot virus, it is 95% a SATA hdd problem.
Try running a "chkdsk /f /r" command from the Start menu or checking the drive with ScanDisk in XP. The system should hang up in both cases.
Then you have 3 solutions - either moving the page file (virtual memory) to a different drive (but the SATA drive will still suck), formatting the SATA drive and hoping it helps or buying a new drive.
In any case, do you have a single SATA drive or two in a RAID?
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