The last would be a pain since you'd want to keep a copy of your save-file ideally (I haven't checked if any of it is kept locally or if all your info is on ESO's servers) and delete everything else on your PC related to ESO; through starting up your PC in safe-mode, if you have to.
I hope that helps, or at least it's a start?
If it's windows, check your running processes in task manager. Does this error occur when you have already played ESO, then close the program, then open again without restarting the computer? In this case the problem could be ESO itself, as sometimes the process does not end correctly upon program closure. Sometimes it crashes on exit and may leave some "junk" processes hanging. Ending those processes with end process/process tree may fix your problem without restart.
unhander_2 wrote: »The only information that is saved client side is Addons and settings usually found in C:Users\<your user name>\Documents\Elder Scrolls Online\live\SavedVariables.
In my experience some security softwares are the usual culprits, if you have an antivirus or similar program, just add ESO to that software's exception list.
Disclaimer: Do this at your own risk, we cant really know what is the actual problem on your side
Really hope things get sorted out mate. Cheers.