Thought I had escaped this issue on Win 10 64bit system. Had my daughter download update while I was at work Wednesday. Once update was complete, even had her log into game. Everything worked fine so had her exit game and shut down computer. When I got home, went to fire up game and got the damned Error 5. Tried a few things but ended up uninstalling game. Went in and manually deleted remaining Turbine folder. Did make sure and backup my pref file and keymapping. From there, downloaded and reinstalled game and all works fine.
ETA: Only thing extra or third party I had was Combat Analysis plug-in. So no SweetFX or anything like that to cause issue.
CAANWICK - Wardenist - Make Wardens Great Again!!! / CAANJOB - The Ettenmoors' worst Burglar / CAANJAAL - Hunter
"If you find yourself in a fair fight, you've already lost!"
Forged in Flames-Crickhollow