Contact List (Hotmail) Hijacked - Mac User - HELP!



I received an email "from a friend". The email was blank but there was an attachment which I opened. It was for a Viagra website.

 

I knew right away this was a virus, having fallen for this scam once before.

 

I deleted most of my contact list right away. 

 

Sure enough about two weeks later someone used my Hotmail account to send suspicious emails to friends on my contact list. Only a few people got the emails - unlike last time when it was my entire list. 

 

I only found out about it when I got some bounce back emails. None of the bogus emails appeared in my "sent messages" box (unlike last time). Also - I had previously deleted my contact list, but the bad emails were sent to several contacts who weren't even on my list - so the virus had a way of getting into my emails themselves, not just the contact list.

 

Here is a list of things I have done so far - I want to know if there is anything else I can do.

 

1.  I purchased and downloaded Norton Internet Security 2010 for Mac.

 

2. I changed my Hotmail password.

 

3.  I spent about an hour on the phone with Norton customer service. The service rep found what he thought was the harmful malware and deleted it. (it was a zip file with a name like "anti-malware" or "anti-virus" or some such. He then scanned my computer and found nothing else that was suspicious.

 

What else can I do to prevent a recurrence. I would prefer not to change my email account name (plus the people on this board all seem to agree that would not help anyway). 

 

HELP!!!!!!!!!!!!!!!!!!!!

 

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[edit: Removed phone number to conform with the Participation Guidelines and Terms of Service. Please do not post personally identifiable information!]