the dell xp cd will work and will activate, however, he will need to use the product key from the dell sticker, not the one that goes in during install ( assuming it does ) in the activation window he'll have to choose phone in, and then change product key to the valid key .. then he should be able to activate it. (Dell keys are only good for installs) I do this with mainboard changes on dells when I don't have an identical replacement board ps. this won't correct the "not connected" problem .. that's different :/