Can't find steam.dll error

This is caused by moving or deleting files in the Steam directory, or the Steam directory itself. If you cannot fix it by replacing the files that you've moved or deleting, you can first try to Reinstall the Source SDK installation. Next, you can try deleting the ClientRegistry.blob file and restart Steam. If that does not work, Steam itself must be installed from scratch.

Additional information: The main steam directory is where the steam.exe is located. This is where the staem.dll file should be located. To my knowledge there should be only one copy of this file. Additional copies as a result of an aborted install or other reason (happened to me) will result in errors.