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RE: After system restore: error message ‘A operating system wasn’t found’

If you have a set of recovery media (that you were prompted to make when you first turned on the system), you'll need that now.  If you don't, I think you'll find only Windows 10 is an option now - Dell doesn't release recovery media for Windows 7 any longer.

You can alternatively purchase a recovery media set from Ebay, etc. for your system.

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