For me i install .NET Framework with this method * I download .NET Framework 1.1 , my language pack , and SP1 for .NET Framework * I decompress this 3 files in a directory. and i run this commands start /wait netfx.msi /qb start /wait langpack.msi /qb start /wait dotnet_sp1.exe /Q With this I haven't any errors ... ++ Sorry for my language ...