|In most cases the video adapter is built into the mboard on a laptop - that can't be upgraded.|
In some cases for higher end laptops, it has a removable video card, but it's probably not ugradable either, unless the manufacturer offers an upgrade as an optional component, or has it for other similar models that use the same mboard, because it probably requires it plug into a proprietary (oddball) slot or connector connected to the mboard.
Apparently your model has NIVIDIA GeForce FX 5200 32mb. If it's an actual video card and NOT built into the mboard (integrated), then there would be no settings in your bios regarding sharing part of the onboard ram for the video.
However, if you don't mind using an external monitor, you can plug in an adapter that will upgrade your video.
e.g. see this Topic: