multiple OS's on the same computer

Hi.
I want to purchase Eset Nod32 Antivirus (4 licenses).
A problem: on some computers I have 2 OS's, Windows XP x86 and Windows 7 x64. If I want to use Eset Nod32 Antivirus on both I should purchase 2 licenses for that computer or is one enough?
Currently I'm using Kaspersky Antivirus (the license expires in less than 2 weeks). With this one only a license per computer is needed, no matter how many OS's are installed on it.


Thank you.

Best regards, John

 

1 licence is enough. see
http://kb.eset.com/esetkb/index?page=content&id=SOLN2393

 

I understand, thank you.

Best regards, John

 

One license is only adequate if you are dual-booting. If the XP OS is running as a VM withing the Win7 one, you will need a license for each.