Check for things like faulty RAM (www.memtest.org), or an overheating CPU (www.cpuid.com/hwmonitor.php) before wiping out your drives and reinstalling Windows. This sounds more like a potential hardware problem than a boot loader issue to me.
yeah i i used the memtest in the grub loader, everything checked out. so i tried disconnecting one Hard drive at time. turns out my 500 gig sata was dying and i guess causing the computer to freeze. it's been removed and all is well (except for the loss of data