Halmer. I would : 1. do a restore point.2. Download SP3 from developers site - dont yet install. (see other threads) 3. unplug from internet. 4 turn off anti spam, firewall and anti malware. 5. Install SP3 - may take some time. 6.Reboot, fire up firewall, anti spam and anti malware. 7. reconnect to internet and check for MS updates.If all fails you can activate restore point. I think most people think that it is worth the effort to keep XP up to date with fixes.