i bought a new motherboard the other day for my amd xp 2100+ and since i installed it i continue to get errors especially the [ access_violation (c0000005) ] when i play diablo 2 and other errors when i play other games and random rebooting while using the os. i have tried reinstalling the os (windows xp) and i never had any problems before i got the new motherboard. does any one have any suggestions how i can fix this error? any help would be excellent!!

it is a gigabyte 7vaxp motherboard
a geforce 4 ti 4400 video card
and a sound blaster live sound card.

are the errors hardware?