Downloaded-Cannot Open

I just downloaded NIS 2009 v16.2.0.7.  I used the removal tool to remove NAV 2009 but the new version will not open.  It's there, all 65.5MB of it but it won't open.  I originally bought NIS 2009 v16.0 but I couldn't get it to update the definitions.  Then I went to a cyber cafe and downloaded NAV 2009 v16.2.0.7.  So today I got NIS 2009 v16.2.0.7 because I had purchased NIS in the first place.  How can I get it installed on my computer?  I hope the removal tool didn't wipe it out.

 

Johnyum