Logon Screen Rotator is a free tool that allows you to change your logon screen background image to images of your choice at an interval of time which you can select.
How to use:
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Install and run the tool.
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Go to the Monitored Folders tab.
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Right-click on the blank area and select Add Folder.
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Select the folder in which your images are and click OK.
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Go to the Settings tab.
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Select the Change Interval.
Now it will automatically change your logon screen background after the interval of time you have set.