E-Mail Virus?

I use Outlook 2007 and it appears to be sending e-mails to lots of people that I know nothing about. Initially, I received a few e-mails back from other peoples spam filters but recently I have been receiving numerous (over 500 a day) "bounce back" messages from my mail administrator because messages have been undeliverable.

My Anti-Virus software (Bitdefender) can't find any virus.

What should I do? I have temporarily set up a rule to delete the bounce backs.

Thanks

Chris Hobbs
chobbersAsked:
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wshark83Commented:
it could be a malware or spware...

user malwarebytes or superantispyware and run a scan to see it bring anything up. update the databases before running the scan....
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Sikhumbuzo NtsadaIT AdministrationCommented:
Remove your antivirus and install another one even if it's trial version, the update it and scan for malware, spyware and viruses.

Then once cleaned - put back your Bitdefender.
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chobbersAuthor Commented:
I tried malwarebytes and superantispyware, which removed some infected files and have now used yet another anti virus, which shows no infections but the problem is still there. Anything else?
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wshark83Commented:
can you use hijackthis and post the log here

--> http://www.filehippo.com/download_hijackthis/
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TaishouCommented:
Are you only seeing bounce back messages? Do you also see actual "sent" emails to people? I only ask because if all you are getting is bounce-back, then your account is probably being spoofed, and you don't have a virus or anything.
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chobbersAuthor Commented:
All I see are the bounce back messages, no actual sent messages. If I am being spoofed what do I do?
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