CX-One Install - CX Progammer won't open ST Function block

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Just completed a licensed install of CX-One on new computer. Everything installs fine and auto-update completed. When trying to open S[tructured] T[ext] function blocks I get the attached popup. Control Panel indicates Microsoft.NET Framework 1.1 is installed. Have tried downloading/installing latest Microsoft.NET Framework 4.5.2 . Stlll no success accessing ST Function block code. Any suggestions how to resolve this?

[Yair 2]

I had the same Error. I tried to restore Windows registry. didn't help The error occurs because some references to libraries of CX-Programmer have been removed from the Windows registry . This can happen if you use "optimization" tools for Windows such as CCleaner or similar. The only solution is to uninstall and re-install everything.