For your .ebc file to be only be 1KB, that would mean that it did NOT install anything. Maybe you don't have the store update. I've read that the store update will no longer install and that you need to copy your old files for that over.
Copy the the ContentPatch folder from the old sims 3 folder to the new one that spawns. It should have a contentpatch file that is 7,976kb in size.
Also, your saves should be in your old sims 3 folder that you renamed or moved before starting the reinstall process.
After installing everything in a the newly spawned sims 3 folder (that has the store update files copied in), then you can copy the newly created dccache folder and pertinent files into a copy of your old sims 3 folder to see how that works OR you can copy over the saves from your old folder to the new one.