When you run Setup from a command prompt, you can modify which components are installed, provide required setup information, or repair an installation.
To run ISA Server Setup-
To modify which components are installed during installation, at a command prompt, type: PathToISASetup\Setup.exe ADDLOCAL=FeatureToInstall.
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To repair an installation using a command-line parameter, at a command prompt, type: PathToISASetup\Setup.exe REINSTALL=ALL.
For a full list of parameters and values, see the table in ISA Server SE Appendix C: Unattended Setup.