See above their are still possibilities i wouldn't give up that fast especially knowing it worked, also Bios updating the Laptop/Notebook might be an option,
but first install the latest whql verde drivers
http://www.nvidia.com/object/noteboo...ql-driver.html or XP
http://www.nvidia.com/object/noteboo...ql-driver.html.
The biggest chances though are via DXVA and a performant renderer (Overlay Mixer,VMR7 Overlay), try DXVA checker and see how that works out
http://bluesky23.yu-nagi.com/en/#DXVAChecker
And as i said i would try Cyberlinks DXVA (Just install powerDVD11 trial) its' very nice optimized and has the highest chances as well as Microsofts own Decoder in Win7 via WMP to work
And if really everything fails their still would be the possibility to try Linux and get it working via VDPAU