how to install another exe(only if it is not already installed) while installing winform application using windows setup in VS2010?

I have created a window setup file for my window project in visual studio 2010. this setup file is running properly and installed the software in computer. but for running my this software i need a another exe file(filezilla server.exe) to run.So, for that i specified using custom action.So,first time when i installing my application, it also successfully installed filezilla server automatically.

But while installing second time after uninstalling my application(not filezilla server),i开发者_运维百科t is again install the filezilla server.so,filezilla installation get exception while installing.

So, I want to check before installing filezilla server whether it is already installed or not.If it is installed, then no need to install filezilla server at all.otherwise, i need to install the filezilla server.

Is there any option available in windows setup in visual Studio - 2010?

Please Guide me get out of this issue?