Hi, I can't install .Microsoft .NET Framework 4 Client Profile for Windows 7 x64-based Systems (KB982670) (using Windows Update). Please see below the details: Installation date: 9/4/2012 9:57 AM Installation status: Failed Error details: Code 643 Update type: Recommended The Microsoft .NET Framework 4 Client Profile provides a subset of features from the .NET Framework 4. The Client Profile is designed to run client applications and to enable the fastest possible deployment for Windows Presentation Foundation (WPF) and Windows Forms technology. More information: http://go.microsoft.com/fwlink/?LinkId=191022 Help and Support: http://support.microsoft.com I tried to install the standalone version, but I get the same error. The problem is a few months old. I messed up smth. trying to install a program sent by one client. I couldn't solve it using the restore option at that time either. Any suggestion would be much appreciated. Thanks in advance!