The following DOS BAT file keeps Microsoft Internet Information Server (IIS) running by repeatedly trying to restart it. Note that when IIS crashes, it also crashes the FTP server so you need to restart that as well.

Tip: turn off the visual display of Dr. Watson error messages. Otherwise that dialog box will be on the screen waiting for [Ok] and this .bat file will not be too effective! The setting is in the registry under software\Microsoft\DrWatson.

rem iis-on.bat
echo off
rem use any log file
set a=d:\log\iiscrash.log
cd %0\..
:loop
net start w3svc
if errorlevel 1 goto wait
rem
rem There is an error when the service was already working!
rem If we get here, the service was restarted.
rem Log the date, time and blank line
echo.|date >> %a%
echo.|time >> %a%
echo. >>%a%
REM FTP
net start "FTP Publishing service"
rem Wait is a utility function from HREF Tools.
:wait
wait 15
cls
goto loop