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From the installation folder, navigate to the 'Prerequisites' directory.
Run the .NET 64 installation if the workstation uses a 64 bit Operating System
Reinstall Workstation Setup
Uninstall workstation setup from Add or Remove programs. Select 'Yes' to remove all DLL's from the registry.
Log in as the Administrator (access through remote session if installing on Terminal Server/Citrix)and install workstation client through Add or Remove Program.