Not able to load Sims 4

Check the logs  for your system in event viewer that you can find in Windows Tools. There should be an event there for the crash. Most of it won't make any sense to most of us so just look for anything that says Sims, EA or Steam. If you can find an error or exception then copy and search it. That is what I do and I always bet that I am not the first one to have the problem so it's usually helpful to find answers. Make sure you have enough free space on your hard drive for the game to run. If you don't it could cause something like this to happen. I see it all the time with people and their cell phones. Stuff will just shut down if not enough room. 

Another thing you might try too since it's minimal, is set your sims 4 to run as administrator. Also, temporarily, you might disable User Account Control settings or UAC. Control Panel/User Accounts/Change User Account Control settings.  I wouldn't think you'd need to do this but if running as admin doesn't help it could be worth a test. If you do, I'd uninstall sims, turn off your Antivirus and then reinstall. Then try to run everything and see what happens. Just don't forget to turn UAC back on as it does serve a purpose. I really think you will find the answer in the logs though.