Hi johnpe,
Nope, that's most likely not related. I experience the same bug upon exiting the game - sometimes at least - and I don't even have the radio chatter volume on. It's a known bug, but since it occurs on exiting the game and thus isn't really a huge problem, this one has slipped down the priority list long ago. I myself don't have to use Ctrl-Alt-Del though, I can just close the error notification, but then again I'm on Win7, so XP might deal with that differently.
As for adding something to a post, just click the button that says 'modify' and you can then change or add things. Alternatively, making a new post in the same topic would have been an option too of course. But no worries about the seperate topic, it's no problem.
Regards,
Fred