I make use of window activation on the way to activate it. Windows 7 after that watermark gone. However at what time I log on using guest account I cannot access program such as advanced system care or else tune up or else Revo uninstaller. It is about group policy. The error message is "This program is blocked by group policy. For more info, contact your system administrator." Can anyone explain what this error means and how to get rid of this issue.
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