If you bought this at Best Buy, you should take it back even if it is past the 30 day return period. Speak to the store manager..tell him you were misled by the salesperson and you want to exchange for a better laptop. The AMD 4200 is not only too weak to be able to play any of the modern games you mentioned, but it is a card that is no longer supported by AMD. The processor for the laptop is another issue all together...get a better one. Look for a Intel I5 if you want to play.
Intel I7 960 @ 3.87ghz *Intel DX58SO *HIS HD6970 2gb *Corsair TX650M *2x4gb Corsair XMS3 *WD Black 1TB *Windows 7 Home Premium 64bit *Gateway HD2401 24" 2ms 1920x1200 ***Asus N71Jq laptop *Intel I7 720QM Processor *Mobility Radeon HD5730 1gb *8gb Ram *Windows 7 64bit
* A clear conscience is usually a sign of bad memory *