It is worth reading:
http://msdn.microsoft.com/en-us/library/bb822049.aspx
In particular:
"Windows Vista does not support a standalone installation of the .NET Framework version 2.0 SP2 or version 3.0 SP2. Windows 2000 does not support the .NET Framework version 3.5 SP1, or a standalone installation of the .NET Framework version 3.0 SP 2.
- " , .NET Framework 2.0 SP 1 SP 2, .NET Framework 2.0 .NET Framework 2.0 SP 1 SP 2. , , .NET Framework 3.5 .NET Client Client Profile.
- , , .
. Somasegar - 2.0 SP2:
http://blogs.msdn.com/somasegar/archive/2008/05/12/visual-studio-2008-and-net-fx-3-5-sp1-beta-available-now.aspx#8515404
dotnetfx35.exe .NET 2.0 2 (SP2) , , . wcu/dotNetFramework/dotNetfx20.
RTM 3.5SP1, , , ( , MS PSS).