Tim Hulford reports an endless cycle of rebooting for Windows XP SP2 with Boot Camp 2.0, and with Windows XP SP3 with Boot Camp 2.1. He offers a "not so great fix":

I noticed on your forum that others have been having problems with Windows XP endlessly rebooting after installing in Boot Camp.

When I initially install XP SP2, it works fine and is stable. It is only after installing the Mac drivers that XP reboots continuously. I've tried getting in there in Start Mode and unchecking "automatic reboot" so I could get an error report, but strangely enough the computer reboots anyway. There are plenty of errors, but they are attributed to "Windows time" etc, not to anything that looks like it should crash the system. I've tried updating Boot Camp to install the latest Mac Drivers, and that didn't help.

My "not so great" fix:

I noticed that the network connection was generating frequent warnings during startup. I tried disabling my network adapter in safe mode and sure enough windows will now boot normally - and I can then enable the wireless adapter and use it just fine without immediate crashing. If I enable the wireless and reboot without disabling it, then I get an endless boot cycle.

I'm running Leopard 10.5.6...and the version of XP I installed was SP2, so I downloaded SP3 (service pack 3) in hopes that this upgrade would fix the problem. I've since downloaded all of the updates I can find (to XP and to the Wireless network adapter) but it has done nothing to fix my problem.

I don't know how to fix the problem permanently, currently I have to remember to disable the wireless each time I log off of Windows. If I don't I have to boot up in safe mode and disable it before I can boot Windows successfully. If there is no fix, then maybe there is a way to disable the wireless automatically when I initiate shut down?

If you've seen this problem