Can't get rid of this virus

Hi!

I own this little company in Brazil and we offer web hosting. Every week I make a backup of my users account - just in case.

What happened was one of my client's account has a virus and everytime I download the backup file to my computer, Norton alerts me that the file is infected and I have to delete it.

I have tried to find the infected file on the server without success. The virus only affects Windows systems so I don't need to worry about the server, right?

What should I do?The backup file is infected by W32.Netsky.AD@mm.

Thank you for your time.

 

 

 

 

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