Downgraded back to 8.1 for Windows and now my USB port has disappeared!

I recently did the upgrade of Windows 10, hated and he was causing problems with closing spontaneously, etc..  I went back to 8.1 for Windows and now my D: / drive is missing.  It charges my phone in order to him exists, but it does not appear in my menu in the Manager of devices or disk management.  I really want to do a system restore unless it's my only option.

I have the model E5-511.

I hope someone can help

a system restore will work.

Tags: Acer Laptops

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