You can use Windows 7 as IIS to host intranet website. Make sure that the system is not connected to internet by any channel to maintain data privacy.

Windows 2003 has IIS6 and not IIS5. IIS 5 was in Windows 2000. If you want to add a site in IIS with same port and IP that existing have, do the following 1) Add the site name in your IIS server's host file. (c:\WINDOWS\system32\drivers\etc\hosts). Mentione the local IP address and the site name next to it. 2) In IIS, start new website wizard. On the screen for IP address and port, mentione the site address that was entered in host file. 3) Complete the wizard and you can run multiple websites with same IP and Ports on same IIS server

You can run shutdown -i which will open a GUI windows that will allow you to restart remote server. This command is in XP, not sure about Windows 7