No, but yes, course there is!
Theres loads of Windows programs used for making music.
Fruit Loops Studio, though not free is one of the most like the Garage Band, allowing to to pick and import a selection of sounds, and pre-programmed sounds that allow for great sounding instruments, and connect a keyboard to record with.
It includes a drum loop synth, and many more effect based synthersizors on there to add echos/reverb/flange, etc, etc.
Its just great to play aound with, and with many tutorials is very good. Though I haven't got used to how to actually use it to create songs yet
I'm sure its pretty simple though when you get the hang of it.
Theres also many more programs like it, but thats just an example of one of the best.