You can't get an exact answer esp. when you don't provide enough info.
I have added some info. Thank You
Disable Express Gate in BIOS. Does that solve the problem?
If so, do whatever is necessary to re-install Express Gate.
If the PC still shuts down after "20 sec" into windows boot, its likely either heat (eg Loose heat sink on the processor) or a psu/gpu problem that pops up once the graphics drivers are loaded and significant power is drawn. In your case, the gpu is the mobo.
Twovoxer Thank you for your advice after trying alot of trys. I finally got into bios and got to the disable the gate as I only had 45 sec to work with. It would quit just as I got there. Then it started up and was running beautiful for about 10 or 15 min and shut off. From there on it was useless. So I boxed it up and sent it back to the Seller. Thanks Again for all you help. Regards stroker99