Word of Warning
Re SP3 install over the internet - If you have a PC that uses Realtek Wireless card & drivers you may need to temporarly reinstate the Wireless Zero configuration service via running Run. msconfig - and then repairing the wireless connection. I used this proceedure ,after I got the little searchlight comming from the wireless icon on the start bar.(highly technical description).
Ie when you get searching for Ip address after the SP3 update. A contribution by anyone on PPRUNE who can explain this situation accurately would be appreciated. There seems to be a difference in the way wireless communications are authenticated under SP3.
(XP x 2 units and a XP Pro unit - connected via WPA - TKIP to a Mk1 BT Home Hub)
CAT III