Uninstall Delphi XE4 -> Serial not valid!

Uninstall Delphi XE4 -> Serial not valid!
Hi all,
I want to deinstall XE4. After deinstalling some additional entries (Embarcadero Help System, Boost-Library), im not able to deinstall Rad Studio XE4. It alway popup a message 'Serial not valid'. Any help would be great.

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