@jennathesimmer Do you use a third-party antivirus? If so, try disabling it and clearing Origin's cache again. Origin might be able to finish verifying the files without interference.
Otherwise, I'd try uninstalling the game and reinstalling it to a different folder. (If you do use an antivirus, disable it while reinstalling.) If you can't uninstall the game through Origin, you can use a tool like Revo Uninstaller (free download) instead. If you do go this route, you might as well uninstall and reinstall Origin too, just to be thorough. Start with Sims 4:
- Put aside your Sims 4 folder in Documents\Electronic Arts and rename it to something that doesn't include the words "Sims 4."
- Download Revo Uninstaller (the free version is fine) from here.
- Launch Revo, select Sims 4 from the list, and click Uninstall.
- Once the game is uninstalled, select "Moderate" under "scanning modes," and click Scan.
- Review the list, in case there's something you want to save; otherwise, click Select All, and then Delete.
- Close Revo, and restart your computer.
Next, uninstall Origin:
- Quit Origin if it's still open, then right-click on the Task Bar and open the Task Manager. Scroll through looking for Origin entries. If you find any, click on them and End Task.
- Next, clear Origin's cache.
- Launch Revo again and uninstall Origin, and when it's uninstalled, select "Moderate" again 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 other Origin games are installed by default.) Delete the rest.
- Close Revo, and restart your computer.
Next, download the full Origin installer and run it. 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." When it's reinstalled, download Sims 4; you can just download the base game at first, to save time, if you want.
Restart after installing and before playing, and allow the game to create a new Sims 4 user folder rather than reusing your existing one.