You receive the following error message after Windows 2003 boots.
At least one service or driver failed during system startup. Use Event Viewer to examine the event log for details.
There is a quite excellent article here on how to debug errors like this; http://networkadminkb.com/kb/Knowledge%20Base/Windows2003/Troubleshooting%20%91At%20least%20one%20service%20or%20driver%20failed%20during%20system%20startup%92.aspx
I found it while trying to find a way to surpress the dialog box, which sadly I did never find (one would think there would be some registry tweak that would disable this stupid dialogbox on a server where the error had no effect and was impossible to resolve)..