The main reason I installed Boot Camp in the first place was to run audio apps like Sound Forge natively. But I'm finding the audio playback under Windows 7 64-bit to be pathetic and wholly unusable. With no other applications running on my late-2008 iMac with 4 GB of RAM, I can't play any audio without massive snapping and popping about once per second. Useless. I had far better audio than this on Pentium machines in the '90s.
I have the latest Realtek driver installed.
The problem occurs no matter what the source, through both the analog and digital outputs.