Don't fix it if it aint broke.

Microsoft says that if you have all of the their XP security updates installed and are using a firewall, then you don't need it. Microsoft also has acknowledged that SP2 messes up many programs including many of their own. What does that tell you?
It tells you that they have yet to de-bug SP2 and by installing it you become one of their beta testers.
Norton's virus programs and Corel are two of many that are affected. Most software companies have published updates and work arounds, but this means that you have to download and install these to straighten out the problems caused by SP2. Is it worth it at this time?
Some of the best experts such as Fred Langa advise you to wait until it is de-bugged.
Again, don't fix it if it ain't broke.
Just my thoughts,
Walt