Is motherboard the problem?

Kyle0050

Honorable
Nov 16, 2013
56
0
10,630
So my computer hat been freezing randomly lately and have re-installed OS(Win7) still froze and now just installed a new ram stick still froze! I was wondering if my problem could be my mother board? If it is my MOBO and I get a new one does this mean I have to buy a new windows 7 product key again? If there are any other hardware that can cause this please tell me!