Re: FBee Acronis could be the culprit
In my experience over the past year, the best route for 'difficult' systems was invariably:
1. Back up user data.
2. Install W7 + SP1 / W8.1 from scratch (or factory reset).
3. Visit MS main page and choose 'I want this POS called W10'.
4. Re-instate user data.
Side note: Freshly-reset W7 machines need at the least IE 11 or Chrome / FF. All academic now I guess, thankfully! But these tips will still work for the paid upgrade I reckon.