Installing Norton Int Sec 2009 on top of Norton 360

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I have 2 PC's Vista and XP with Norton 360 v2.5

 

I just purchased Norton Internet securiy 2009 on CD 

 

Can I just install NIS on top of N360? 

 

If I need to uninstall N360, will I lose all network mapping and settings (trusted sites , etc) 

 

 

thanks