No resolution as yet, I have 2 systems, one it reboots on and one it doesn't. It will last anything from a few secs to 2 or 3 mins. Really annoying. Only seems to be when winamp and the in-line plugin is used. Not an issue under radiator.
Both systems are XP pro with SIS chipsets, but the good one is AMD and the bad one is Intel.
I have done a clean install on both. I am very frustrated by this problem.