I would strongly suspect you have hardware problems. If that is the case, software
or settings won't solve it. Memory would be the first suspect.
Run this: http://oca.microsoft.com/en/windiag.asp
Software diagnostics won't always be able to detect errors but it would be a start.
Hardware testers are the only sure way of diagnosing hardware issues but you would
have to be a service facility to afford that equipment.
The memory could be OK but the motherboard could be failing if errors are detected.
Not all that unusual as hardware ages... You could also have hard drive issues
so no way of really helping from a forum. This very much sounds like a "hands on
issue" to really test and determine you problems. (either failing memory or HDD
can cause data corruption and loss that can make Windows sick to non-functional)
Try the Intel App Accelerator from the link I posted earlier and see what happens.
Intel did have some issues that could be helped by installing their drivers.
