Have you tried running these executables in safe mode? To rule out driver issues?

You could also try an OS on a CD, like Ubuntu or BartPE to see if the stability issues are related to your hardware. Or image your current install using Driveimage XML (or ghost or similar) and do a quick re-install and see of the issue disappears. Then you can go back to your original install from the image. Problem is, if your hardware is playing up it might corrupt the drive image, so that would be a last resort.

If software is not the issue, things like this are usually either ram (test with memtest x86) or PSU related. Bad PSU's can cause strange problems.
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