You appear to have an undetected or hidden trojan spambot sending out emails.

What is your firewall as that too should be able to block unauthorised outbound connections ?

If you haven’t already got this software (freeware), download, install, update and run it, preferably in safe mode.

  1. SUPERantispyware On-Demand only in free version. Or AVG anti-spyware (formerly Ewido) Resident scanner during trial On-Demand after trial ends. Or Spyware Terminator Resident scanner.