happyoutkast The "already running" error after a failed launch is relatively common and not necessarily part of the issue. While troubleshooting, please restart your computer each time the game doesn't open.
For the troubleshooting itself, have you removed the entire Sims 4 folder from Documents > Electronic Arts yet? If not, please do so now. This will remove, but not delete, your saves and other user data. Just see whether the game opens at all.
If that doesn't or didn't help, please provide a dxdiag. Click Windows key-R, enter dxdiag in the run box, wait for the scan to finish, click "Save all information," and save the file to your desktop. From there, you can attach it to a reply using the paper clip (Attachment) icon included with the other formatting buttons.