I used MusicBox soundfont. I've got Soudblaster Live Card. It's not even official supported in Windows 7. I had to download modified drives and still it's not playing even loud enough to cover my headphones needs(bug in drivers). When it's possible I'm using ASIO4ALL and it's working generally ok, still I have to use low-samples settings when it comes to VST real-time recording.
I'm also using Mixcraft as a Midi Editor and Midi Recorder, because it's software the most similiar to GarageBand, which I'm sometimes using on iOS.