When is the last time you updated your graphics driver? Try going to Nvidia's web site and download the latest driver that supports the Geforce 9 series and your operating system.
This is good advice but do take note if your machine feals noticably hotter after updating. Its quite uncommon but I knew one person who had serius overheating issues using anything but the driver set provided by his laptops manufacturer.
I don't think you need to get the driver from the manufacturer any more, Nvidia changed how they do drivers a good while back and everything works off of the same package. My 9800m gtx's always have the latest driver on the Nvidia site. 280.26 is the current one.
If they've finally forced manufacturers to allow the direct-from-Nvidia driver, that's great.