How to Remove old SystemWorks and not mess up NIS 2011?

I am posting this here as I want to remove a product without messing up NIS 2011.

 

Here is the situation...

 

I have had SystemWorks 2009 (ver 12.0.1) and NU ver 22.0.0.52) along with NIS 2011. All work OK, but I got NU 15 (ver 15.0.0.122). The issue is that I would like to remove NSW as I believe that I no longer need it since NIS 2011 and NU 15 are also on my system. I am asking for a good way to remove NSW and the old included NU as I understand that it is very easy for a removal tool to remove NSW and also screw up NIS 2011 and the new NU 15. Is there a foolproof way I can do this and leave the other 2 apps alone?

 

TIA