I have had my PC do a reboot on several occasions whilst running the application. So far it has rebooted only when transmitting and the first thing I notice is the S meter stops responding to voice and then about a second later the PC reboots. I seem to remember this happening some time ago when I was running an audio recording program. No other application causes such a reboot. I'm running XP Pro and am thinking it is sound related issue. I'm not after a fix as I beleive it is an OS problem. Just giving you a heads up as an awareness thing.
Thanks for telling me about this Daryl. You are the only person to report this problem. Use Google to find the latest driver for your sound card. It seems like a problem with the sound card driver. Sound card drivers are notorious for needing to be upgraded.