install.exe /S /qb-! /f

or try the following

Suppresses all UI screens during installation.

dotnetfx.exe /q:a /c:"install.exe /q"

-or-

msiexec.exe /i netfx.msi /qn ADDEPLOY=1


suppresses all UI screens except for a small progress dialog during installation.

You can run setup in unattended mode with one of the following command line switches:

dotnetfx.exe /q:a /c:"install.exe /qb"

-or-

msiexec.exe /i netfx.msi /qb ADDEPLOY=1

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