your best bet would be to create a new partition and install xp, and then use xp to run the games simply because vista is a resource hog. An extra GB of ram will do it the world of wonders aswell but not sure if you will be able to run at native res (especially if thats not a typo). Basically it will run some game's but doubt you will be able to run at full grafics and could be laggy, not up to date with the gpu you have but being a 3 id say its getting on which means you wont be able to play the latest games because your gpu wont take some of the software(eg pixel shaders). All i can say is try it.But the 4400 should fix that.
With your pc locking up try a program called gamebooster, it will free up alot of your pc and ram, i get almost an extra 2GB(i have 6) of ram using it.
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