Dual Boot OS vista and XP

Hello everyone I am new here and i have been using Norton products since i bought my first PC

 

Now i have a PC with dual boot OS (Vista and XP sp 3), is it possible for me to use my NAV 2009

on both OS with only one (1) account?

 

Which is recommended: NAV 2009 or NIS 2009 or NAV2009 + NIS 2009.

 

I need your quick response guys..

 

Thanks

 Adam