That question is open to many answers. When installation of UC and Capture went well but you still can't record anything in, or play anything from Capture then my guess would be that something's off in your computer's configuration. Here is a good place to start reading up on that: http://support.presonus.com/entries/30006160-How-Do-I-know-my-StudioLive-Ai-is-connected-to-my-computer-and-functioning-over-firewire-