XP/Gates want me to install SP2. I've been using ZAP 4.5.594 over the past year and am very happy with its stability and function. I have not ventured into the ZAP5 region because of issues noted here and on other forums, yet it appears that ZAP5.1 is the only version sanctioned for SP2. Looking for opinion from the gurus here...stay with ZAP4.5 and install SP2, upgrade to ZAP5.1 and install SP2, or hold off on SP2 until ZAP5 compatability issues are solved (5.5?)? If its relevant, I connect to web via cable modem/wireless router.