When creating an installer packing in VS.NET 2008, the default option is to install as "Just Me" instead of "Everyone". This blog entry for VS.NET 2003 details this nicely -- but it is outdated. As that post details, you have to edit the MSI database to get it to work.
However, in VS.NET 2008, there is a property on the Setup project itself named "InstallAllUsers" that defaults to false. Simply toggle it to true and you're in business.
I just thought I'd add this so others who google for it don't go through the heart aches that used to be required in earlier versions of VS.NET.