Updates path

Hi,

I am running Windows Vista Premium x86 SP 1 and Windows XP Home x86 SP 3 with NOD32 AV on both. I use a 256k internet connection.

Questions:

1. Where are the NOD32 AV updates stored, what is the path ?
2. Can I copy the updates to a folder to put them back when I reinstall sytem(s)? Is it worth doing so?
3. I mostly use Vista now, but I do use XP sometimes too. Can I update my XP NOD32 from the Vista's partition, so I save time and traffic not having to download to XP same updates which I have aleady downloaded when I was in Vista?

What is the official policy concerning the usage of Nod32 on home desktop with 2 operating systems? Am I supposed to do this? (My vendor said yes)