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I'm having the same issue with a Dell Optiplex 360. I can install a base image of Windows XP SP1. The only added drivers I needed were for the Broadcom NIC. Once the image was installed I updated all of the other drivers and all Windows updates including SP3. When I push out the image it seems to go OK until the machine get stuck in an endless reboot cycle. I'm going to try the same steps with all the Windows updates except SP3. I'll post the results in a little while. Tim