Remove all your RAM, blow out the slots, and operate the system with one stick at a time in the first slot (yes, they're marked.) If they all exhibit the same problem individually, then the motherboard may be faulty (one common failure mode is bursting/leaking capacitors.)
if you have another functioning PC, plug the HD from the failing one into it and use it to check the drive for failures. (Computer > r-click on drive > properties > tools tab > error checking, check all boxes.)
I'd generally go with RAM issues (poor contact or failed modules), but the mention of volmgrx.sys would make me want to also check the SMART info on the system drive (Crystal Disk Info is good for this) as well as doing a complete CHKDSK on it.
Remove all your RAM, blow out the slots, and operate the system with one stick at a time in the first slot (yes, they're marked.) If they all exhibit the same problem individually, then the motherboard may be faulty (one common failure mode is bursting/leaking capacitors.)
if you have another functioning PC, plug the HD from the failing one into it and use it to check the drive for failures. (Computer > r-click on drive > properties > tools tab > error checking, check all boxes.)