is there any garageband for windows?
Our usual answer is "GarageBand for PC costs $500 and comes with a free Mac mini computer."
Seriously, though, there is no equivalent for GarageBand on PC. You're going to have to spend more than $500 on software for Windows to come close to GarageBand's functionality. And you'll be buying three or four different programs/plugins that won't work well together.
One all-in-one candidate might be Cakewalk Project 5, which costs $259.
http://cakewalk.com/Products/Project5/default.asp
Then there's Sony Acid Pro 6 for $375.
http://www.sonymediasoftware.com/products/acidfamily.asp
Then there's Propellerhead Reason 3, $499.
http://www.propellerheads.se/index.cfm
GarageBand is a great app, especially when you realize it comes free with every new Mac.
So, when you think about it, the Mac Mini (with all the free great apps, including GarageBand, that are all designed to play and work well together, is a heck of a bargain!
Hope this helps you.
old G4 Mac OS X (10.4.9)