NET Framework can be located on the Microsoft Download Center. Download and reinstall the versions of.You will need to download and reinstall these same versions from Microsoft. NET versions 4.0, 3.5, 2.0, and 1.1 installed, first remove 4.0 then 3.5, then 2.0, and finally 1.1. Note: Be sure to remove the latest version first. For more information on using Programs and Features, refer to the article from Microsoft regarding how to Uninstall or change a program Uninstall or change a program linked below in Additional information. NET Framework from Windows using Programs and Features in the Windows Control Panel. Remove all existing versions of the Microsoft.End of extended support for Vista was April 11, 2017. These instructions are provided as a convenience for those still running on these obsolete versions of Windows. Section III: Obsolete versions of Windows: Vista Should any of the above steps fail to resolve the problem, create a new Windows User Profile and repeat the removal and reinstallation steps under the new Windows Profile.After running the tool, restart the machine.