When reinstalling Outlook Express via: %SystemRoot%\System32\rundll32.exe setupapi,InstallHinfSection DefaultInstall 128 %systemroot%\inf\msoe50.inf %SystemRoot%\System32\rundll32.exe setupapi,InstallHinfSection DefaultInstall 128 %systemroot%\inf\wab50.inf How do you specify the CD-ROM drive? By default, it looks in "C:\WINDOWS\inf\i386" which doesn't exist.