I have been having the same since the patch last week. It makes no sense really, considering it's always worked fine before.
rainfeatherpearl wrote: »Every. Damn. Patch.
Error 1005 again on today's patch - I think eso64.exe is the problem file, as it somehow seems to have locked its permissions up in such a way that the system Administrator account can't even edit or delete it.
So here's what I did (which also fixed it last week):
Restart the PC into Safe Mode, then delete eso64.exe from Zenimax Online > The Elder Scrolls Online > game > client. Restart into normal mode, then run a Repair in the launcher. It'll download a working eso64.exe and you'll be good to go.
And that should be fine until next week, when somehow, the update will break the permissions of eso64.exe again, and you'll be going back to Safe Mode to delete it again.