Ditto Nick. The twice ive installed SP2 over a fully installed pc its went up its own backside. When installed onto a fresh windows install it runs great though.... much quicker and more stable.I wouldn't do it unless you are doing a fresh install. A lot of people had endless problems whilst sticking it on an already existing system. I personally just haven't bothered.
If your experienced enought, then I think he means a blank install of XP, followed by SP2. However it may be worth trying it with your system restore discs if you have any trouble in its present state. I for one have had no issues, and indeed sp2 is excellent.when you say a fresh install do you mean after the system restore disc's?