I upgraded my pc recently and have had crashes and reboots since. I think it is either my motherboard, unsigned drivers (note plural), or PSU (not likely though). The parts upgraded were my memory, HDD, CPU, and motherboard (see profile for details). I have run memtest (4hrs) and it was fine. I ran chkdsk and it seemed to complete okay. It did reboot automatically when finished.. is that supposed to happen or did my pc just reboot? I crash when playing games, when copying files from one partition to another (on same HDD), when installing, and listening to music. MY SYSTEM IS NOT OVERCLOCKED. These are some BSOD messages:  Stop: 0x0000008E (0xC0000005, 0xBF8A1606, 0xA10E1B80, 0x00000000) win32k.sys - Address BF8A1606 base at BF800000, Datestamp 43446a58  IRQL_NOT_LESS_THAN_OR_EQUAL Stop: 0x0000000A (0x621CBBE0, 0x00000002, 0x00000001, 0x8051DFD6)  IRQL_NOT_LESS_THAN_OR_EQUAL Stop: 0x0000000A (0x39D30208, 0x00000002, 0x00000000, 0x8051E0BC) I have attached some minidumps and some output in Event Viewer. PLEASE HELP!!!!!