First of all, which operating system are you using (Vista, 7, 8, etc.).
I'm sure there are some version that may not be compatible.
I would first re-downloading the install file and then re-installing.
You could also try to download an older version of the software too to see if anything different happens.
I've run across some problems with exe files that require you to right click it and select 'Run as Administrator' rather than just double clicking. Could try that as well.