Stuveltje - that log file looks clean except that I would shut off some of the virus programs as they may conflict with each other. I would also shut down Windows messenger unless you need it.
It looks like you have raid set up for your drives?
I noticed youre also loading Windows Media activeX on startup - unless youre doing a lot of D/L of movies and music constantly, it might be better to run that when you really need it.
I would then run the update to SP2 for Windows XP which will get a pretty fresh copy of all of the windows drivers - and if ya want the extra protection, the IE SP2 update as well - Ive been running it for some time and it seems to be running a little cleaner - has a builtin popup blocker.
I would also D/L and install the Webroot Spy Sweeper and let it run once to make sure that nothing is in your hosts file and some other little hidden places
