Yes, it works fine. By fine I mean, try not to install anything else at all, or at least not things that sit in your task bar all the time, and make sure you follow all the tips on getting it to run properly.

Protools would make a XP machine with SP2 bluescreen but they hada patch out pretty quickly that fixed this.

Unless you are talking about the free version of protools, if so then no it doesn't work with XP.

Yeah i was talking about the free version...

But do i "get" anything by having protools if i already have cubase sx?

no, none at all.

Then im not going to get protools.

when it comes to editing audio protools can't be beat, its the king . but it sucks with midi. I run protools with logic 7 slaved to it. logic cant be beat in terms of midi functionality . the best of both worlds. I have also slaved cubase SX to protools and it works fine but make sure you got a fast computer. just think having protools capabilitys with the wonders of vstis to go with it. theres something to think about.