Outlook Express repeatedly sending emails.

With a AV and Malware Scanners?

I would recommend Spy Bit S&D

http://www.safer-networking.org/en/download/index.html

and Malware Bytes

http://www.download.com/Malwarebytes-Anti-Malware/3000-8022_4-10804572.html?tag=mncol&cdlPid=11004434

as Malware scanners.

Col

I can almost guarantee that if you had Antivirus 2009, there is more you haven't found yet.

Check in Safe Mode (no internet connection) using MalwareBytes, Spybot Search and Destroy and CCleaner (multiple times). Once everything you can find has been removed in Safe Mode, reboot to normal and check it again with all tools, removing anything it finds. Then, connect to the internet, make sure each tool is updated and check AGAIN!