stuck on "preparing game"

MORIMORAolol​  Did you try removing the entire Sims 4 folder from Documents > Electronic Arts?  If not, please do that now.  This will remove, but not delete, your saves and other user content.

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.