Try using the regedit function. Open regedit and search for the program's name. For example, if I want to see exactly where the Roxio label creator resides on my machine I'd do this:
regedit > type in Roxio > find next
I know it's on my C: drive so I'd use F3 (find next) until I locate it. On my machine it eventually shows:
C:\Program Files\Common Files\Roxio Shared\Label Creator\CDLabel.exe/ReallyCreateANewDoc
Warning: Make sure you know how to use the regedit function and don't accidentally delete anything. You'e just using regedit as a search tool.