Uninstall NAV 2009 Reinstall NAV 2008

I am having some issues with my computer turning off instead of going into standby, screen freezing while on the Internet, etc. I want to uninstall NAV 2009 and reinstall NAV2008. Will my 2009 subscription transfer over and will I be able to get Live Updates? I don’t know if this will resolve my issues but I thought I’d give it a try, since my computer seemed to run just fine while on the 2008 version.