Hello, I arrived home yesterday to an E-mail from an old work colleague stating I may have a virus as had sent her an E-Mail about investment opportunities.  I have not sent this E-Mail, I ran my anti-virus, deleted all contacts and deleted messages but when checked this morning, i receive a postmaster failed email sent at 4.50am to an ex-contact with the same attachment - please help me to stop this, I am not techy minded so unsure what to do next? Help!