i'm not too familiar with your model of laptop but
generally laptops are not very upgradeable
aside from (ram, hd, swappable drive)
everything else is difficult because there is a lack of common components
especially for things like video cards which are usually built into the board itself

general updates for ur graphic driver should be available on toshiba's official website... but not too sure abt upgrading your graphic card... i also heard most components of a laptop are usually SPECIALLY manufactured... which means.. it's very difficult to find another graphic card that would fit ur laptop.. although i did hear that some newer laptop models support EXTERNAL graphic card ^^