yahoo.shared.dll is a DLL file that belongs to the Yahoo.Shared program. It is not completely clear if this is a dangerous file or not. It is still in the process of being reviewed. If it is popping up on your computer as an error, you might want to have your computer scanned in order to verify its origin.
This can be done with ZookaWare PC Cleaner. ZookaWare PC Cleaner offers a free initial scan that can give you a “diagnosis”. It will be able to tell you if you have additional errors, as well.
Fixing and cleaning errors in your registry is critical to a smooth running system. If you do not prevent errors from happening with a trusted cleaner then you may continue to experience them. Once you invest in ZookaWare PC Cleaner, you can set it to run regularly. Then you feel assured that you are keeping your registries error-free.