ok, copy your important data to external storage, find and download your drivers and then do a clean reinstall of windows. if it doesn't fix it, get a new psu, anything around 500W would do just fine, seasonic, antec, xfx, corsair are all good brands, if that doesnt fix it either you need to change your motherboard i guess.
try to run also prime95 to stress test your cpu+motherboard alone and furmark to stress out just the graphics separately in case one of those care having problems instead of the motherboard. but they would overheat before failing so i doubt it.