Well, there are a few different paths you could start down to test it...
1. Try a Live Distro of Linux - do you have any issues there? If so, it's hardware, not software... unless you can narrow down said issues to drivers - usually only driver issues there will be the display adapter (maybe) or a network/wireless adapter.
2. Download Ultimate Boot CD, or individual tests, and test your RAM and Hard Drive to be sure - even brand new ones can be bad or go bad in an instant.
3. See what is going on in your system:
- What is showing in your event logs
- Download a more advanced process viewer, such as this one:
or any others listed in the forum thread, thread779-1586273.
- Run some various virus scans if all else fails.. or take a look at your installed software - if you start in Safe Mode, does the problem go away? What AV/Security software/suite do you have installed? Do you have any disk monitoring utilities installed (optical or hard drive).. those can cause issues sometimes.. also any indexing programs could be locking things up...
Anyway, that's where I'd look based on the info you've provided...
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"If to err is human, then I must be some kind of human!" -Me