VGN-FZ31S no longer supported by Sony so no driver updates available. Now using clean installed Windows 7 in place of Vista supplied with laptop. Power DVD 12 will not run Blu-ray disks, states graphics driver "incompatible" although Cyberlink's own BD advisor software shows graphics card to have all neccessary functions. Obtained latest driver for GeForce 8600M GS from NVIDIA but will not load as graphics card not recognised by the installer software. How may I install this NVIDIA updated graphics driver? Sony should supply means to unlock the BIOS from blocking updating drivers once it no longer supports the computer.