[C#] Check if a particular program is installed

Afternoon folks!

Simple one (Me hopes)!

I have a program that manipulates a text file, which another program will in turn use, but I want my program to check for the presence of the other program on the users hard drive. The program I want to check for is installed properly using an installer.

I think it can be done by checking certain registry keys, but I don't know any more than that, aside from the name of the .exe, the program knows nothing else about the program. Any pointers?

The installer probably adds an entry to the user's Add/Remove programs list, which is at HKCU\Software\Microsoft\Windows\CurrentVersion\Uninstall.