I have been coming across a lot of clients, who provide fresh Vanilla Windows 2008, Windows 2008 R2 servers with .net 4 installed. Unfortunately this could lead to issues with MOSS and SharePoint 2010 installations.

You can use the following commands to get rid of them
.NET Framework 4 product family


Below are various options of uninstalling .net 4 from your server. Find the option that best suits you and copy the two associated lines of code and save them as a batch file. Once done execute that batch file.

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.NET Framework 4 Client Profile (32-bit) – silent repair
%windir%\Microsoft.NET\Framework\v4.0.30319\SetupCache\Client\setup.exe /repair /x86 /x64 /ia64 /parameterfolder Client /q /norestart

.NET Framework 4 Client Profile (32-bit) – unattended repair

%windir%\Microsoft.NET\Framework\v4.0.30319\SetupCache\Client\setup.exe /repair /x86 /x64 /ia64 /parameterfolder Client /passive/norestart

.NET Framework 4 Client Profile (32-bit) – silent uninstall

%windir%\Microsoft.NET\Framework\v4.0.30319\SetupCache\Client\setup.exe /uninstall /x86 /x64 /parameterfolder Client /q /norestart

.NET Framework 4 Client Profile (32-bit) – unattended uninstall

%windir%\Microsoft.NET\Framework\v4.0.30319\SetupCache\Client\setup.exe /uninstall /x86 /x64 /parameterfolder Client /passive /norestart

.NET Framework 4 Client Profile (64-bit) – silent repair

%windir%\Microsoft.NET\Framework64\v4.0.30319\SetupCache\Client\setup.exe /repair /x86 /x64 /ia64 /parameterfolder Client /q /norestart

.NET Framework 4 Client Profile (64-bit) – unattended repair

%windir%\Microsoft.NET\Framework64\v4.0.30319\SetupCache\Client\setup.exe /repair /x86 /x64 /ia64 /parameterfolder Client /passive /norestart

.NET Framework 4 Client Profile (64-bit) – silent uninstall

%windir%\Microsoft.NET\Framework64\v4.0.30319\SetupCache\Client\setup.exe /uninstall /x86 /x64 /parameterfolder Client /q /norestart

.NET Framework 4 Client Profile (64-bit) – unattended uninstall

%windir%\Microsoft.NET\Framework64\v4.0.30319\SetupCache\Client\setup.exe /uninstall /x86 /x64 /parameterfolder Client /passive /norestart

.NET Framework 4 Full (32-bit) – silent repair

%windir%\Microsoft.NET\Framework\v4.0.30319\SetupCache\Client\setup.exe /repair /x86 /x64 /ia64 /parameterfolder Client /q /norestart

.NET Framework 4 Full (32-bit) – unattended repair

%windir%\Microsoft.NET\Framework\v4.0.30319\SetupCache\Client\setup.exe /repair /x86 /x64 /ia64 /parameterfolder Client /passive /norestart

.NET Framework 4 Full (32-bit) – silent uninstall

%windir%\Microsoft.NET\Framework\v4.0.30319\SetupCache\Extended\setup.exe /uninstall /x86 /x64 /ia64 /parameterfolder Extended /q /norestart

%windir%\Microsoft.NET\Framework\v4.0.30319\SetupCache\Client\setup.exe /uninstall /x86 /x64 /parameterfolder Client /q /norestart

.NET Framework 4 Full (32-bit) – unattended uninstall

%windir%\Microsoft.NET\Framework\v4.0.30319\SetupCache\Extended\setup.exe /uninstall /x86 /x64 /ia64 /parameterfolder Extended /passive /norestart

%windir%\Microsoft.NET\Framework\v4.0.30319\SetupCache\Client\setup.exe /uninstall /x86 /x64 /parameterfolder Client /passive /norestart

.NET Framework 4 Full (64-bit) – silent repair

%windir%\Microsoft.NET\Framework64\v4.0.30319\SetupCache\Client\setup.exe /repair /x86 /x64 /ia64 /parameterfolder Client /q /norestart

.NET Framework 4 Full (64-bit) – unattended repair

%windir%\Microsoft.NET\Framework64\v4.0.30319\SetupCache\Client\setup.exe /repair /x86 /x64 /ia64 /parameterfolder Client /passive /norestart

.NET Framework 4 Full (64-bit) – silent uninstall

%windir%\Microsoft.NET\Framework64\v4.0.30319\SetupCache\Extended\setup.exe /uninstall /x86 /x64 /ia64 /parameterfolder Extended /q /norestart

%windir%\Microsoft.NET\Framework64\v4.0.30319\SetupCache\Client\setup.exe /uninstall /x86 /x64 /parameterfolder Client /q

.NET Framework 4 Full (64-bit) – unattended uninstall

%windir%\Microsoft.NET\Framework64\v4.0.30319\SetupCache\Extended\setup.exe /uninstall /x86 /x64 /ia64 /parameterfolder Extended /passive /norestart

%windir%\Microsoft.NET\Framework64\v4.0.30319\SetupCache\Client\setup.exe /uninstall /x86 /x64 /parameterfolder Client /passive /norestart