Backdoor.Generic.119374

I have been seriously hit byBackdoor.Generic.119374 an old and dangerouse virus. This virus has stolen all my email address and probably more. Over 50 people have been emailed remotly from another IP address. Avast did not see this one comming. Do I realy want to upgrade to a payed version.
I used an online scanner BitDefender that cleanrd my computer.

Desmond.

The fault is not the free version, as the paid has same protection.
Do you have any infected file that could be submitted to Alwil team for analysis and improve detection?

Check your computer for Malware with

Malwarebytes Antimalware http://filehippo.com/download_malwarebytes_anti_malware/
after install click UPDATE and run quick scan, click on REMOVE SELECTED to quarantine anything found

SUPERAntiSpyware http://filehippo.com/download_superantispyware/
Are cookies really spyware and are they dangerous?
http://www.superantispyware.com/supportfaqdisplay.html?faq=26

If anything is found come back and post the scan logs here