ur logfile appears clean. but do post it at
www.hijackthis.de to get it auto-analysed...
do check out the new hijackthis.de. it looks cool an also gives it suggestions.
here are its readings for u legolas :
It seems that you don't use an anti-virus scanner or your scanner is not active. Only an anti-virus scanner can protect you against new viruses. You can look here for a good anti-virus scanner.
We didn't detect any active process of a firewall on your system. Reasons maybe:
(1.) You are using the windows firewall or a hardware firewall.
(2.) You are using a firewall of an unknown vendor.
(3.) You are using a firewall, but for unknown reasons it is disabled
(4.) You don't use any firewall at all.
We recommend you to use a firewall. Download and install one or activate windows xp´s own one.
generally speaking : reduce ur startups & run "ccleaner'.

see if
MAKE WINXP STARTUP/SHUTDOWN FASTER ! or
MASTER TUTORIAL: Make Your Windows XP Super Fast !!! helps u.