After installing Update Retriever for System Update, and then downloading update packages, my xSeries 226 server stopped shutting down properly.  A restart operation via the OS fails and the system hangs.

After grabbing updates, the system tries to install the Lenovo SMBIOS device using the drivers it just obtained.  Don't let it.  I went into Device Manager and found a SMBIOS device that had installed itself, using Lenovo drivers.  I removed the device, rescanned, and found no such device anymore.

I'm running Windows 2003 x64 Server with SP2 installed.

The system reboots properly now.  Strange...