Windows XP Service Pack 2 (SP2)

If you run WinXP you should install it. You may already have downloaded it through the automatic-updates in Windows, or you can get it from the site or order a CD. SP2 fixes many window errors and increases security. I particularly like the PopUp Blocker (as a user) but as a marketer does this *finally* spell the death of pop-up windows? Still... you should install SP2 and remove what you don't want - later. Windows XP Service Pack 2