If your version of Windows is 64-bit, you're able to install both 32-bit and 64-bit software programs, so there are two ...

Windows is a 64-bit OS and runs only on 64-bit processors ... It was also the first time the computer booted directly into Windows, rather than being loaded after booting up in DOS.

A 64-bit computer is not twice as fast as its 32-bit predecessor. The 64 bit "word size" is only one aspect of internal processing. The CPU's clock speed, along with the speed of storage ...