Download CPUID Hardware Monitor from the internet. Its free, but watch I think you need to pick the appropriate version depending on your operating system(32 or 64 bit). I don't know if you will be able to get it loaded and installed with the computer only running a few min.
My second guess is that we may have a problem with the memory. Is this 8g of memory all new? Did you set the memory specs in the BIOS?
How about dirt/dust in the computer, you did not indicate how old it is?
I cant install anything without the computer shutting itself down but if nothing else the computer doesn't even feel warm.
The memory is all new as memtest+ popped up millions of errors when I tested it, how would I set the specs?
The computer has been freshly cleaned out so no problems there.