I've got a WaveFinder as well. I've only ever got it going once and it's been duff ever since. It was under 2K but I upgraded to XP.
I'm not even sure my WaveFinder still works. There have been reports of the regulator and ADC chip burning out and needing to be replaced. Also the PSU is apparently underrated and turning off those LEDs helps... I'm not impressed to say the least with this Psion/Radioscape product. The fact they're charging for the new drivers isn't helping!