The Windows NT Resource Kit has a handy utility called kill.exe which is better than net stop... if the server crashes, net stop won't work because the service won't respond. I use the following in a .cmd file:

  kill inetinfo.exe
  kill mtx.exe
  net start w3svc
[download]

What I'd love to find is a Perl script that runs as a service using Win32::Daemon and can test the server, and if anything does not respond, kill it without shell commands (can't do that as a service!) and restart the server.