Based on your post #
4, suggest you run memtest. Do step 9 of post #
3.
Ran the test and my memory is fine. No errors and I'm actually surprised
STOP 0x0000004E means PFN_LIST_CORRUP. It is caused either by a device driver or by RAM failure.
During windows installation, it is hard to be a driver issue.
If you are sure (after how many passes?) that RAM is not corrupt, I doubt that the errors are coming from some bigger source like a motherboard failure.