please help me on 64 bit and garageband

i have a 64 bit computer and it has 2 program files directories.. I installed spore on default recommended folder.. it installed on the program files x86 folder which means the 32bit folder.. is it ok to leave it there or is it better to have it installed on the 64 bit folder(without x86)? and also, I want the garageband from ilife of mac but I think it doesn't have one for windows... is there any alternative software like it? especially the feature which enables you to use the qwerty keyboard as piano keys to play music... Thanks!

Try Steinberg's Sequel- but it'll cost you $100. It's very similar to Garageband (but more powerful), and has lots of quality loops for you to work with.