Sorry to hear about your problems. Though I may have a solution for you. Since you have been doing repeated clean installs but still suffer from the BSOD, the ONLY valid assumption is that you have a hardware problem, not a software one. To this end, we have to narrow down the hardware issue.
You mentioned that your computer only BSODs when it is "stressed". What do you mean by that? Like high-end gaming stressed, or emailing some pictures stressed? If it is the former, then I believe we may have solved the problem. First, let me make sure you've done the following:
You ran Memtest (or equivalent) for at least 8 hours?
You reset your computer BIOS to default?
You removed all non-essential components from the computer, and it ceased to BSOD?
You replaced these components with new ones/known good ones, and the BSOD starts again?
In my experience in IT Support, I have only seen one DOA motherboard and two DOA processors, and all of these were DEAD dead, not kinda working dead. Therefore, I believe it is safe to say that these components aren't the issue. Especially if you have successfully run Memtest, which effectively tests all these components, I don't see the problem being there. Also, you are able to boot into Windows without a problem. Though most people don't realize it, booting an OS is one of the best tests for hardware performance, as the OS goes through and initializes most components, if not utilizing most mobo components in the process.
Therefore, the one black sheep left that no one realizes but has been responsible for 95% of hardware problem I've dealt with is: the Power Supply. Because the PSU is an analog component, minor factory variations can compound in a drastic way to cause mischief and mayhem during load. And since you're saying the problems only occur during stress, my very strong hunch is that your PSU is to blame. If you have another computer, you could swap PSUs (make sure the known good PSU is rated for enough load), but you may have to get another one.
EDIT: I noticed that you didn't post your PSU specs in your first post. Did you verify that your PSU is rated for the components you've selected (i.e. does it have enough watts)? If you post the brand/wattage of the PSU, we can check for you.
If you have any questions, reply back here, and we'll help you as best we can.
Edited by Nick2253, 01 November 2010 - 04:57 PM.