Net frame work 3.5 is an add-on, to install go to (Control Panel) then
Select (Uninstall a program) then select (turn windows features on or off)
Check the check box and ok it will install...
All programs have a uninstall option. Removed by going through control panel
Programs and Features or by going to folder in (program folder or program folder x86)
and looking for uninstaller...
(windows mail) if on the start screen right hand click on it to get uninstall option