Elke87 Your dxdiag is full of crashes of a component of a Realtek audio driver. The installed driver is from 2015, so it wouldn't be a surprise if it stopped working properly.
Please try to update it and anything related. Hit Windows key-X, choose the Device Manager, expand the Audio section, click on each entry in turn, and click the green and black Update button. Repeat for everything in Sound. Windows will probably not find updates for everything, which is fine; the point is to make it look. Once you're done, restart your computer and try again to play.
If this doesn't help, please unplug your speakers and test again. Even if you wouldn't want to stop using them, it's a helpful test.
If that doesn't help either, please look for new errors in the Reliability Monitor. Hit Windows key-R and enter "perfmon /rel" without quotes, and you'll see a chart of errors and updates with a column for each day. Today is on the right.
Look for an error that happened at exactly the time of your most recent Sims 4 crash. If you find one, double-click it to see more details, then copy that info and paste it into a reply here. If you don't see a new error, check back in an hour or so—the Reliability Monitor doesn't always update right away.
