I use WinDAB on Win2k and find it to be very reliable. About once a month WinDAB will refuse to power up the Wavefinder and this can only be resolved with a reboot. Apart from that I have no problems with it, I use it for streaming to my work machine most days and ususally use it for local playback every other day.

I have not used DABBar for more than few minutes as I didn't like the UI.

Are you running any personal firewall software on your machine ?