Remove annoying dashed lines from Excel when printing and previewing

Check your gridlines settings in Page Layout.

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How to block specific application (exe) from running in Windows

Use gpedit.msc and use either of these two methods :
To block specified applications :
>> User Conf./Administrative Templates/System/Don’t run specified Windows applications
To run only specified applications (might take a lot of work to populate):
>> User Conf./Administrative Templates/System/Run only specified Windows applications