Spontaneous reboots with BC 2.1

I successfully installed the Bootcamp 2.1 update late last night. As soon as I was done I booted back into Mac OS. This morning I've had three spontaneous reboots while in Windows XP. When booted back into Windows, Windows gives me that familiar serious error dialog box asking if I want to send a report to Microsoft. The reboots have all happened within about 5-10 minutes of startup and while doing different things each time. Haven't figured out a pattern yet.
Anyone else experiencing this? I've been running this setup for about two months now with no prior problems.
Thanks,
Jan
2.8GHz 24" iMac, 10.5.2, Windows XP SP2.

Please also see my other post which has got a lot of views, but no answers. I'll post this also to there. So I backed up my boot camp partition using Winclone and then opened up the MacBook Pro with Windows XP as the operating system. I turned off Norton Antivirus (I thought the more basic system would have less potential interactions with other systems) and downloaded bootcamp 2.1 again. Installed it and then restarted and then turned Norton back on (Norton AV has actually been a pretty stable version from my recent experience). My external keyboard is now connected and so far so good-- the computer has not been giving me the BSOD every 20-30 minutes. I remembered from long ago-- on the mac side-- I was always told to turn off virus software before installing any new software-- maybe that's what it needed? I will continue to update.
I never got a blue screen while downloading updates to windows. I've only gotten BSOD after that initial attempt to install Bootcamp 2.1 with antivirus software turned on. And I'm backed up so I can go back to version 2.0 if necessary.
Mark:)

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