I don’t know how to configurate the Windows XP events page…
Well, the Security page can be configurated, add or remove kinks of events. The others just have filters for type or date…
avast! tab do not seem to have an special configuration as far I know. Right now I`m on a Windows Me and cannot see that XP feature…

The avast! log viewer is the master log of avast. If you let if in the lower option (Debug), it will include all categories above… If you move the slider up, some events won’t be logged (the categories bellow).

Logs are generally for troubles. As my avast works perfectly, I rarely see the logs ;D