I use both XP SP3 and XP SP2
Reasons not to install SP3:
1) Very large, takes time/bandwidth to download.
2) Installs things that I don't want/need installed.
2.1) Microsoft Windows Installer 3.1
2.2) MSXML6 SP2
2.3) RDP 6 (Remote desktop)
For example having RDP 6 installed on my machine, breaks another critical application I use.
(Paint.Net != Critical)
I'm sure for 99+% of the world, having XP SP3 as a minimum requirement would work.
I'm however part of that less than 1% group.
P.S. The easiest way to see your Windows version is to press the "Windows Key" and then "Pause/Break" simultaneously
(assuming you can find those keys) :wink: