I'm sorry but what are "switches"? and I also don't anything about "silent install" because my knowledge of computer is very much limited. I just simply go to www.adobe.com to download the adobe reader 7.0 . First I would be asked to choose language, platform, and connection speed, then I would be directed to the next page to start the download by pressing the 'Get Adobe Reader' button shown below. After saving the file in the c:/program files, the download starts, and after processing ADOBE READER up to 100%, the error message appears: InstallShield: Command line parameters: /L language ID /S Hide intialization dialog. For silent mode use: /S/v/qn /V parameters to MsiExec.exe /UA<url to InstMsiA.exe> /UW<url to InstMsiW.exe> /UM<url to msi package>