The command cannot be performed because a dialog box is open. Click “OK” and then close open dialog boxes to continue-
That is very simple method I will show example for solve this problem , actually this type error coming first time when are you purchase laptop and pc. because I think not more knowledge about related software , operating system, this message error same was come with me
Error message
The command cannot be performed because a dialog box is open. Click “OK” and then close open dialog boxes to continue
Salutation
first remove free antivirus in your laptop and pc
then purchase Antivirus or install in your laptop and pc. after install antivirus must be restarted then to be check again error I hove you error message solved.
That is my experience once time error was coming so I have share with you. now you can try if you are satisfied.