This guide will let you know how to fix the Steam Failed To Load Steamui.dll error. You have to follow the simple instructions to fix it.
First, you will need to go to the steam folder in your drive and then right-click on the bin folder.
After that, select the delete option to delete it, then open up Steam, and you will see that it will automatically start updating your steam app. When it is done then there will be no more errors.