Re: Sims 3 launcher running in tray while playing.
@fruitsbasket100 @TrexterZiam I just did a bit of testing, and this issue shows up for me as well (again, I'm on a Steam install and running Windows 10). I'm not sure exactly what's going on, but I did figure out how to avoid it. Hopefully, this will work for other people too.
If you are not on patch 1.69, you should be able to launch TS3 directly from an executable called TS3w.exe (note the "w") inside your program files. You can make a shortcut on your desktop so that you don't have to keep digging through the program files. Depending on your install, the way to get there might vary, but this is how it looks for me:
(C: ) Program Files (x86)\Steam\steamapps\common\The Sims 3\Game\Bin
Note that the last part (The Sims 3\Game\Bin) will likely be the same for everyone, but the part after Program Files (x86) may be Electronic Arts or Origin Games (not sure). A search for TS3w.exe should turn it up, though.
If you're tied to Origin at startup and can't bypass the launcher with TS3w.exe, try signing into Origin and putting it in offline mode, then disconnecting your computer from the internet. This also works for me, even if I don't bypass the launcher.
If the launcher is still running in the tray, it can be quit through the Task Manager. Press crtl-alt-delete, select Task Manager, and then scroll through the background processes until you see "Sims3Launcher." Select it and click the button that says "End Task."