Unable to execute program from installer

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http://superuser.com – I created an application (exe file) and in order to deploy it I am using two ways: Using zip file: I zipped the entire contents including executable. This method works and the end user is able to execute the program successfully ! Using 3rd party Installer: I created an installer based on zip file using NSIS but the problem is when the end user tries to execute the executable, splash screen of the executable is being shown for 1-2 seconds and then nothing runs ! I am unable to figure out what's the problem. Any help would be appreciated. (HowTos)