Need Help to update NIS11 to NIS12 Please

Hi all,

 

I have to help a friend who lives in Milan, to install NIS 2012 on a PC where NIS 2011 is already installed and I have to do it by phone since he lives about 500 miles from where I live.

Can someone tell me if it is better to do it without uninstall the old version, just updating, or it is better to first uninstall the old version?

Specs: - Win Vista sp2 on an HP Desktop 1 n half year old

            - 4 GB ram       

            - Intel core 2 Quad @ 2.66 HZ

            - HDD 1 terabyte

            - 1GB video card.

Usually I have no problem to do it alone, but saw the problems that have occurred to some users by installing NIS12, I have a bit of fear. So I wouldn't create problems at my friend to which I have recommended the type of PC and the security suite that is NIS11 last year and NIS12 now.

Many Thanks in advance for your suggestions.

 

    Sandro