fortunatly I didn't buy all 4. i bought 2 of them and the other 2 were obtained when i supplied new p.c's and gave them a $25 discount if i took their old pc. but they have at least a 1.8 ghz cpu in them.
i have 3 kids and they always seem to need the pc at the same time.

I will give windows 7 a go, I have a spare 250 gig hard drive so i will try it on that. That way if its a pain then i can go back to xp. or i will just have a dual o.s pc.

Thanks for the comments guys