My Sims 4 Keeps Crashing

MBSims74​  What OS are you running?  DISM is a built-in command in Windows 10 and 11 but not in 7.

Regardless, if you still need help, what exactly is happening?  It sounds like you're seeing a crash when you enter CAS, but I'd like to be sure.

If you're getting a crash with no mods or custom content present, 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.