Is it possible to determine in uninstaller script is a program (that should be uninstalled) working?
                +2 
                A: 
                
                
              
            If you want to detect if your program is still running, you can use your knowledge of the programs internals to detect either a special window class or a mutex used by the program.
If you don't have anything other than exe name to go on, use one of the nsis plugins:
                  Anders
                   2010-10-06 21:00:26