I'd step up to the A8 APU, i think they're somewhere like $20 to $40 more but you get faster graphics, and a faster core clock with an unlocked multiplier if you decide to go with a discrete GPU.
How much are you paying for it? It generally wouldn't be a good gaming system at all. At similar price you could get much better one, because APUs are generally expensive for their performance when it comes to gaming.
its bought already by my husband, meant for school work for my 5th grader but he'd like to play these games if we can do a simple upgrade, it is a desktop computer
Also, could you take some picture of inside the PC when the side is taken off? There are few different versions of the card, and I'm sure you want to get a compatible one . Upload the pictures to www.imageshack.us
I'd need to see whole case for its size and the power supply info, which is a label on a box that looks like this: