5(Access is denied.)' while attempting 'RestoreContainer::ValidateTargetForCreation'

The most common problem - 5(Access is denied.) - when you try to restore db back up..
It is so simple to solve =))

You should change your server "log on" to LocalSystem

How ?

1- First find Sql Server Configuration Manager

2- Right click your server and select properties

3- Change It to LocalSystem and restart the servers

I faced with this 5(Access is denied.) problem and solved like this..
No  5(Access is denied.) stress any more :)