Problem solved using the instructions on this link
http://tamrielfoundry.com/topic/how-to-migrate-your-eso-install-from-eso-beta-to-eso-live/

Relieved to see I'm not alone here Ekofrozen!!

Also attempted full repair to no avail, along with many misc. fixes/checks to correct other errors. I'm typically very patient, but this is starting to get to me! *Starting to have Diablo 3 "error 37" flashbacks here...haha

Anxiously waiting for DxDiag ticket to be reviewed.

Thank you for posting also, as this is the first I've actually seen another person struggling with Error 11.

after re-installing I've gotten an error 302 message that seems to require me to download the game a fourth time. I've also just recieved word from my school's IT department that I've taken up 34% of all total bandwidth used in the last 5 days, and that if I do not cease this action my wireless priveliges will be terminated. Needless to say I can't afford that, is there a workaround available for this that would allow me to get in game without downloading another 22 gigabytes

Mine was already the number 0 in the usersettings file. also when I try to repair it gets stuck at 17% and still getting fatal error 11 on the play button

Say it isn't so Eko! =( Hahah, Congrats to ya for getting it to work though!
...guess I can only hope the 5Gb 'update' I currently have downloading is the same cure to Error 11

Thanks for update all the same!

The prevailing logic is that errors 11 & 12 are essentially the same thing, for instance, what fixed my error 11 was intended as an error 12 fix. Hope that helps.

I have tried all suggestions and still getting error 11 very frustrating....

Had this error 11 problem. I was on the beta, so I still had all the files and launcher installed on the computer. Tried to uninstall everything that wasn't the "new" ESO. Nothing changed, still same error. Tried to repair, but it basically wanted to "repair" the whole 22 GB of game, therefore I'd rather uninstall the game and download it again from scratch. I consider myself lucky, because my Internet - most of the time at least - is quite fast. I dread thinking about those people who wait for days before the download is actually finished, to then find out the file are bloody corrupted or whatever happened to them.
I'm in work for 9 hours a day - not mentioning the travel to work - and I don't have all this time to spend playing. Still though, it's one of the things I like to do on my free time. What drives me mad is that people lately waste most of their time re-downloading the game/updates because they get corrupted whilst being downloaded, and we're all paying for this. Not only the first pay off to buy the actual game, but also every month to be able to play. I think it's not fair.
I've also read about people sending tickets and not even getting an answer. I can understand there's thousands of people playing this game, with consequent thousands of tickets, but for god's sake, we are all paying.
Just disappointed.

SET RequestedNumJobThreads "-1"
SET RequestedNumWorkerThreads "-1"

I have two and neither of them "X" both have numbers and not sure which one I should change

any help please?

Hey there @neophytegod,

Can you try repairing the client and let us know if that helps? To do this, head to the launcher and select Game Options, which is above the news ticker. From the drop down, select Repair and let it run.

Also, can you let us know if this issue occurred after the recent 1.4 patch, or if this is a new installation of the game? Thanks!

My game just started showing up with error 11 after the 1.4 patch aswell

1.4.4's brought up the an Client Fatal Error 6 on launch. I'm doing a repair now. I tried XP sp3 compat and admin, no dice. So, we'll see if this works.

EDIT: Repair worked.