Disable DMA then run defrag. Inpage errors can very often be linked to display problems and graphics cards. Even software that effects widows appearance (display properties) on screen can cause this type of error.
The problem is it could even be you CD/DVD ribbon connection that causes the problem. You seem to have tried most of what I would have. The only other thing is CPU heat and yours is well within the limits.
Not sure is this will help, but worth a look.