The general syntax for installation of Internet Explorer 7 from the command-line is:
Where PackageName.exe is the file you downloaded, like IE7-WindowsXP-x86-enu.exe and /switch is one or more switches, like on the following command line:
IE7-WindowsXP-x86-enu.exe /quiet /norestart
The Setup switches are:
/passive - No user input is required. Windows Genuine Advantage validation occurs and updates are downloaded. /quiet - The Setup user interface is not displayed. Windows Genuine Advantage validation occurs and updates are downloaded. /update-no - Setup does not download updates. /no-default - Setup does not make Internet Explorer 7 the default browser. /nobackup - Setup does not backup the files needed to uninstall Internet Explorer 7. /norestart - Setup does not cause the computer to restart after the installation. /forcerestart - Setup forces the computer to restart after the installation. /help - Setup displays a list of command-line switches. /log:<path> - Setup creates the <path> log file.