did you recently install something!?
Sounds like its trying to finish an install of something as you boot back up but its failing.
First thing to try would be to re-install whatever you installed recently.
then try...
go to start --> run --> and try 'msconfig' ... it should work, but not sure if they included it in win2k3
If its there, go to teh startup tab and See if there is anything in there like setup or msiinstaller.exe
Or start --> run --> regedit
then traverse down the tree to
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\Run
See if there is anything in there like setup or msiinstaller.exe