Memory 1GB PC2-4200 DDR2
That's what the specs say so...I'm not sure if his computer can handle faster RAM, so let's say it doesn't.
Opps, ok here's something:
Memory Capacity 1GB DDR2
Memory Speed DDR2 533
Form Factor DIMM 240-pin
Memory Spec 512MB x 2
Memory Slots (Available/Total) 2/4
Maximum Memory Supported 4GB
Ok, you could do this. http://www.newegg.com/Product/Produc...82E16820141241
Will speed up his computer a lot. He needs to take out all his RAM, and just add those 2 sticks.