what does 64k mean? 64kbps or 64kHz or something else?
We haven't had any problems ourselves after installing XP SP2, but I'm sure some people do...
unfortunately your sort of error is very difficult to resolve, and is often caused by something funny going on in your windows install, and may not be directly related to our software. The only thing I can really do is give you a diagnostic version of switch and have you try that.