How can i get rid of eshowbest bulk email virus?

My outlook is sending out bulk emails to all my contacts with the below message or a variation of it. i've tried AVG 8 anti-virus and Kaspersky both of which are not picking up anything. (it has been sent out twice so far)

Anyone know a manual way of getting rid of this if the anti-virus software is not finding the cause?

or could it be a spam email that i am inadvertantly looking at in auto-preview or something?

!! it could possibly be a hack on my hotmail account. i've tried changing the password and deleting my hotmail contacts to see if that stops it.
Subject: Heya,
     how are you doing recently ? 
 I would like to introduce you a very good company which i knew.Their website is   <>  .They can offer you all kinds of electronical products which you need like laptops ,gps ,TV LCD,cell phones,ps3,MP3/4,motorcycles  etc..Please take some time to have a check ,there must be somethings you 'd like to purchase .
Their contact email:  <>  MSN:
<> <>
TEL:  +86-015083417649
Hope you have a good mood in shopping from their company !

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spenderrAuthor Commented:
I checked my hotmail account and found that the messages were sent from an IP address in China. i think a hacker got hold of my hotmail password.

the anti-malware tools were useful though as they picked up a few things as well. thanks for your help.
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