Settings...update & security...recovery..revert back to earlier version (if you haven`t waited too long)..then delete the Windows update folder from your pc or it will continue to upgrade time after...

I was starting to think that way....D Link DWA 171...Windows says best driver already installed..I will look further into it..many thanks for your suggestion.

Thanks for the reply...yes..one of the first things I did try..no joy

Running Win 10..got pop up saying I needed an upgrade..which took place...after this my internet speed dropped from around 75Mbps to around 1Mbp!..If I roll back to previous version of Win 10 the...