MATLAB: Deactivation and Activation Problems

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When I start MATLAB, a popup titled "Deactivation Required" shows. It says my license, Individual – Standalone Named User, is no longer eligible.
When I chose to deactivate, MATLAB says, "Unable to Write to Drive".
Even stranger if I activate through Help->Licensing->Activate, my license which is on my computer works fine.
This repeats every time I restart my computer. How do I keep MATLAB activated?

Best Answer

This really looks like calling MathWorks installation support is the right thing, as the technical answer might depend on your license type.