Here's how to convert your 32 bit windows to 64 bit. For this demonstration we use Windows 8, but it will work on most versions of Windows without a problem.
All you have to do is make sure your computer is compatible with 64 bit by checking in your computer settings as shown in the video, and then install Windows 64 bit over your existing operating system.
Warning: This will clear any user settings, and programs. Your data will be backed up automatically to a Windows.old folder in the root of your C Drive.
Have fun taking advantage of your new 64 bit operating system!