Avast cannot find and prevent!!

Some wiruses had downloaded to my cumputer from false link. Avast didn’t found any on my computer, but I’ve delete them manually (found by creation date in C:\Windows). Now my computer is sending numerous mails, some from my (!!!) mailbox and Avast can’t find anything. Sometimes 1-50 error(s) occurs about “multiple content message” or smth and sk if prevent, but I have this icon which is shown during E-mail Resident Shield scanning (it is shownign uncountable IP’s and www’s adresses). Plz help somehow!!

Antispyware applications (freeware): download, install, update and run it.
Ad-Aware
Spybot Search and Destroy
Spywareblaster
A-squared
Ewido
Webroot Spy Sweeper:
Microsoft AntiSpyware

If nothing is detected, well, maybe it will be better an on-line scanning.