After a long search and reading other articles related to this problem i couldn't remove the discount column from the email confirmation.
I did all that was said in this article http://forum.virtuemart.net/index.php?topic=121694.msg415295#msg415295, but with no success.
So, if someone can tell me what i have to do i will be really thankful.
Thank you
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http://forum.virtuemart.net/index.php?topic=121694.msg426051#msg426051
Thanks but the problem is still there :(
It didn't worked for me the response from Lanthan