I do not suggest that you install the Service Pack 2 update to Windows XP just yet. Seems like Bill jumped the gun on this one. I installed it on my laptop, and it slowed it down a bit. Even though it is now available via Windows Update, hold off a bit. Check back here for updates.
UPDATE: Some have reported success with SP2. So, you’ll just have to download and install it and see how things go. If it won’t work for you, just go to START>CONTROL PANEL>ADD/REMOVE PROGRAMS>and remove Windows SP 2 (a.k.a. Windows Service Pack 2).