Are you trying to install an older version of Photoshop Elements? The ability to sign up for Photoshop.com has been disabled.The Photoshop.com storage service is being discontinued as we are migrating users to our new photo cloud service Adobe Revel. Currently Revel users do not have the ability to have their own named urls. You will not be able to do this with Photoshop. Did you try to enable a sync or interface with Photoshop.com? This forum is for Revel, so I am not very familiar with the settings in the old Elements program. If there is a place to enable this communication or login, you should disable it.
Let me know if you have any other questions