I downloaded Windows 10 to my Acer Aspire 5253 laptop thru the offered upgrade. Lately I have been getting a notification to activate Windows. Sometimes it appears and goes away after a while and sometimes doesn't appear at all. I have been using this copy of Windows 10 for four months and this activation request just started recently. Anyone have any thoughts or ideas about this? The laptop is running fine so I just don't understand why this is happening. Thanks for any help.