Try to reboot in Safe mode and delete them from there. To do so either right click on the Windows button (Right-Bottom-Left default) and select Run, press the windows button and type run or use short-cut Win+R keys, type msconfig, press enter. Go to boot tab and on the Boot options select Safe boot and Minimal and then reboot. In Safe mode to get back to normal boot fallow the same steps but this time deselect Safe boot.
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