new EA app uninstalled Origin

@indycutie  Just to clarify, do you see Origin in Downloads or Documents, or both?  OneDrive doesn't affect the Downloads folder, but it can sync (and therefore interfere with) the contents of Documents, which is why I asked.

@indycutie  Please delete everything in Downloads with Origin in its name.  Then use this guide to uninstalling "the hard way" to remove any leftover Origin-related files:

https://help.ea.com/en/help/origin/origin/manually-uninstalling-origin/

Restart your computer, and don't open the EA App.  (Make sure it's not running in the Task Manager as well.)  Download a fresh copy of Origin and run the installer as an admin: right-click on the download and select "Run as administrator."  Restart again when it's installed, and again make sure the EA App isn't running.  Then try to launch Sims 3 from your Origin game library.

If Origin doesn't think Sims 3 is installed, right-click on the game icon in your library and select Locate Game, then choose the location where the game is installed.  It might help to run a repair afterwards (in the same right-click menu).  Then launch the game from your Origin library and let me know what happens.

@indycutie  You can't just copy an installed program from one computer to another.  So either we get Origin installed on this computer, or we figure out how to make the EA App work.

For Origin, what happens when you try to install it?  Do you get an error, and if so, what does it say?  Please also run a dxdiag and attach it to a post.

https://help.ea.com/en/help/pc/how-to-gather-dxdiag-information/