i m wondering if i can improve my video card in anyway because i m mostly useing this for games and the new games that are coming are to strong for my current card. when i got this computer it said on the website that it has "expandable memory up to 1024mb" is it possible to improve this video card? [buynig a new card is an option...]

The term CARD is frequently mis-used. Most laptops, probably including yours, have onboard video - video built to the mboard. A video CARD is removable and plugs into a slot directly connected to the mboard. You probably do not have a video CARD. "...it has "expandable memory up to 1024mb" .." That means you can go into the bios Setup and change the amount of ram that is shared with the onboard video so that it shares as much as 1,024mb = 1gb. Since you probably have 3gb of ram installed, that setting is probably set to 128mb right now.

so i can change it from 128mb to 1gb? will that slow down the computer

Since you probably have 3gb of ram installed, you probably won't notice the difference regarding overall performance, since even with the max amount shared you still have 2gb available to Windows, and the video will probably perform better.

i m mostly useing this for games so will the games run better to especially the new games dont currently dont even work... oblivion doesnt work well unless i put the graphic settings to low or medium but once i change this will i be able to run it like in ultra high without it crashing or being incompatible?

also please explain how to change this once i m in the bios because when i went it looked kinda confuseing and i dont want to ruin anything