Most of the applications have an specific installers for different version of Windows. Depending on the bitness of the operating system, the installers must match the right version for your computer.
Below is a short guide on how you can determine if you are using 32-bit or 64-bit of Windows 7.
- Click the Start button , right-click Computer, and then click Properties.
- Check the under System, check the value of System type.
- You will see 64-bit Operating System for 64-bit Windows and
- You will see 32-bit Operating System for 32-bit Windows