Initilization Error at startup?

@Simologist  If you move your existing Sims 4 folder out of Documents\Electronic Arts, is a new one when you try to launch the game?  Please test just to see.

Please also unplug any nonessential peripheral devices, especially any external drives or USB sticks.

If that doesn't help, please uninstall Origin using Revo Uninstaller, and install it in a new admin user account.

• Put aside your Sims 4 folder in Documents\Electronic Arts.
• Download Revo Uninstaller (the free version is fine) from here.
• Launch Revo, select Origin from the list, and click Uninstall.
• Select "Moderate" under "scanning modes" and Scan.
• If Revo finds any remaining registry entries, select all, delete, and click Next.
• Revo will display "Remaining Data and Folders."  Select all of them except for the "Origin Games" folder, if it appears.  (This is where Sims 4 and other Origin games are installed by default.)  Delete the rest.
• Close Revo, and restart your computer.
• Create a new admin user account with only letters and numbers in the username (no special characters, accents, etc.), and do not link it to any other accounts.

Boot into the new account, download and install Origin using the full installer.  Here's the direct download link:

http://download.dm.origin.com/origin/live/OriginSetup.exe

Be sure to run both the installer and Origin itself as an admin: right-click on each and select "Run as Administrator."