Borderlands 2 *Error*

Have you tried checking the gearbox support forums?

error, give me dlc :V

Did you Verify the Integrity of the game files?

You can try delete the file "appmanifest_49520.acf" in steamapps folder and restart Steam. Borderlands 2 will show as "uninstalled", just double click and it will install again, just downloading missing files

IO errors are usually when users are doing teh 'fake out' of the steam folder using symlinks

It can also happen if you're not running steam as an administrator

Also try changing yoru download region as getting different data may help