I also get a few BSOD's which contain no specified error.
The specifications of the PC are:
ASUS M4A87TD (Not the EVO or the USB3, just the normal M4A87TD).
Phenom II x4 980 @ 3.7Ghz
8GB Corsair XMS3 1333Mhz (2x4Gb)
GTX 550 Ti
Atrix 650w PSU
Samsung Spinpoint 1TB HDD
Samsung SH-S223C 22x SATA DVD RW
I have run memtest86 for about an hour on both modules of the RAM. No errors were conceived on either of them.
I would really, really appreciate any advice, fixes or solutions anyone can give me. I planned on this PC lasting me a good two/three years before needing an upgrade.
In my experience, the CPU is the least likely to be the issue. I would start with removing one of the sticks of memory and seeing if the issues go away and repeat test with second stick of memory and so on. Memtest86 is a memory error confirmation tool, it is not full proof end all error tester, it is not 100%. Next I would try a reseat of all the RAM/CPU. Next I would try another HDD with a new install of Windows. No need to delete your install, just try another HDD with from scratch install, use another copy of Windows if possible. Next if possible, I would try to get the motherboard replaced if easy to do. I would think by then you should discover your issue. If not, make sure no other accessories except for mouse and keyboard are present and if errors after that, use a different keyboard and mouse as well. Good luck.