That's interesting! I did actually mention that the AMD update seemed to be causing issues, but they told me that the AMD website would identify whether I had the correct driver. So I tried that and it told me that I had the correct driver - obviously that was the problem as clearly I hadn't as you state.
Still, I far prefer the Acer Aspire ES1-131 to the HP 10-e011sa - especially since it has cost me nothing apart from several trips to Oxford!
Surely the real issue is Microsoft not checking to ensure that their updates are fully compatible with consumers' devices?