Please Help! Computer is sending Email by itself

I must have some sort of virus or spyware my computer will try to send out like 200 emails at a time is doesn't do it constantly just like once a day. I have symantec antivirus and it blocks all the e mails and leaves a dialog box on my desktop for each one that it blocks ( this is the only way that I knew that it was happening) but when I get home from work I will have to go and clear off between 100 and 200 of those dialog boxes. anyway I know something is not right. I also have ad-aware SE personal and have ran it and removed everything that it found. I run it regularly about once a week. Please give advice. Thanks

pick out one or two of these to do a online scan:

BitDefender Free Online Virus Scan
http://www.bitdefender.com/scan/licence.php
check AutoClean under Scan Options.

Panda ActiveScan
http://www.pandasoftware.com/products/acti…CACHEHINT=Guest

Kaspersky virus scanner
http://www.kaspersky.com/virusscanner

TrendMicro
http://housecall.trendmicro.com/housecall/start_corp.asp
check Auto Clean.

F-Secure virus scanner
http://support.f-secure.com/enu/home/ols.shtml

eTrust Antivirus Web Scanner
http://www3.ca.com/securityadvisor/virusinfo/scan.aspx

ok I did that and even while the scan was running my computer was trying to send emails and the virus scan didn't stop it. It did it the whole time the virus scan was running and continued to do it after the scan also, any other advise? Thanks

next step would be to post a hjt log.

link here, download at left side;

http://www.tomcoyote.org/hjt/

download, install hjt then post the log in this forum;

http://forums.tomcoyote.org/index.php?showforum=27

i wll look for your post and reply there….shelf life