Failed to load SteamUI Localization File

[SurlyJason]

I recently updated Windows 7 to 10, but I played some games since, so I don't think that's related. Now when I launch Steam, it starts updates, then stops at that error, and I can't get past it. Here is what I've tried.

Deleted ClientRegistry.blob, steamclient.dll, SteamUI.dll, and then restarted

Stopped all 3rd party programs I could to see if one was locking a required resource.

Reinstalled Steam

Removed Steam, restarted Windows, and reinstalled.

I also emailed Steam support, but they've been slow and useless.

[Iceira]

this could be security issue also.
if you cant get it to work then it could be the migrations, this is exatly what happend to some users then we upgrade to win10 then it was release within firstyear free upgrade offer.

make the win10 dvd from that tool app, so you can make a fresh install if needed. and no even then some turn off firewall and antivirus app. steam will not accept it.

if this dont work you are in trouble
exit steam
keep steam.exe and stemapps folder with the games.
delete all other files and folders in steam install folder.
reclick steam.exe ( if it cant rebuild itself )
then you have a bad migration from win7 to win10. ( this is both in administrator rights to steam and not even sure system is worth keeping, ( imo ) most ppl today have pc for gameing. and then client fails, its typical a system issue.

and i doubt steam will give advice in what to do, go see admin transfer ownership and take over right to same user. ( as i said a security issue, it can be done but what about other apps. no my friend i think system is gone or roll back and uninstall security reboot first then try migrations again some say it is the security that doing it. )
and this is why rinstall a fresh win10 is faster , and you dont waste more time on it. if it fail again then what.