I recently maxed my hp pavilion a430n from 512 to 2Gb of ram. BIOS showed the ram and system worked fine for a few minutes then crashed to blue error screen, this happened twice, now it will not boot up unless in safe mode. Reported errors were DRIVER_IRQL_NOT_LESS_OR_EQUAL and Kmixer.sys. Im guessing i need to update a driver/s but i dont know what. Thanks for any help.