Are you sure you are updating Ad-Aware and Spybot S&D before running them, and are you using the latest versions? Are you sure virus scans are coming up clean with updated definitions? You need to crosscheck Norton with an online scan - try housecall.trendmicro.com . Your HJT log is definitely showing malware.
Winlogin.exe is a Trojan virus. You also have "Bundleware" which is like VX2 and Look2Me, and is very difficult to remove. Try this:
http://www.look2me.com/cgi-bin/UnInstaller
You are running XP - and without SP1 you are vulnerable to some exploits. I also don't see a firewall running.