So in short: you'll see some packages that come with Windows, and some that come with applications you install. And if you're running 64-bit Windows, you'll see both 64-bit and 32-bit versions of each package.
So in short: you'll see some packages that come with Windows, and some that come with applications you install. And if you're running 64-bit Windows, you'll see both 64-bit and 32-bit versions of each package.