ok weird one i installed the NVIDIA GeForce Quadro Graphics Driver 310.40 for FreeBSD 64-bit update last night and this morning my home-built PC looked like this in teh browser:

little colored blocks, flickering lines, someitmes a whole strip of teh screen goes green for a moment... it doesn't crash, it just looks horrible... my stomach dropped because artifacts usually mean dying hardware, right? but it's suspicious that it satrted exactly after the upadte. how do i tell which one it is without spending money?
windows update said 'this will only take a moment' 3 hours ago