If you receive the error,
X of X slides that were being published to http://sharepoint/slide/library failed. Try publishing again
when trying to publish a PowerPoint file or slide to a SharePoint Slide Library where X is the number of slides in the presentation, make sure the WebClient Windows service is present on your computer and started.
To see if it’s present and its status, open an elevated CMD prompt and use sc.exe:
sc query WebClient
If it’s stopped, start it:
net start WebClient
The service may not be on your system. The WebClient service is normally a part of the client machines (Windows XP, Vista, 7, 8). On Windows Server you need to add the Desktop Experience Feature which will install the service. You’ll need to reboot as well. Once the server is back up you can start the WebClient service.
That said, WebClient is a client service. It’s not needed on a SharePoint server, just the end users need it. You shouldn’t be installing the service on a SharePoint server unless you know what you’re doing. 😉