Sounds like you have a soundcard latency problem on your PC. You need an ASIO driver with its latency set to below 20ms if you are going to monitor and record in real time through a PC soundcard (look in audio sytem setup)- or you could monitor through the KN speakers and just use the PC for playback.

If your soundcard doesn't have an ASIO driver try asio4all (www.asio4all.com), it works a treat!

Cheers,

s.