While running my computer for longer periods of time (i.e. two weeks), my computer has the tendancy to restart in the middle of an application. However, when it restarts, my computer will not boot up into Windows 2000. I receive different messages everytime I try to boot up, such as KMODE_EXCEPTION_NOT_HANDLED, REGISTRY_ERROR, IRQL_NOT_LESS_OR_EQUAL, and CONFIG_INITIALIZIATION_FAILED. Once I run it long enough (i.e. a minute or so), I here a faint clicking and then I can hear my hard drive spinning. The problem is that my computer will start working after a period of time. The first time it took a couple of hours, and most recently, took a week.

My system configuration is:
MSI K7T Pro 2-A
AMD Athlon 800Mhz
30 GB Hard drive
4 GB Hard drive
256 MB RAM
ATI Expert 2000 Video Card
Sound Blaster Live Value
Windows 2000