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Which version did you try to play on both days? Origin and Steam's patch versions are different. Also do you remember if the launcher showed that you had the EP installed, assuming the world you played on was from an EP?
There's an issue with this game that causes the sims launcher to be constantly running in the background, even after you've quit the game. Exit Steam and Origin (they will attempt to shut down the game first if your task manager didn't help) and restart your PC. A fix for that, just in case it happens again can be found in this guide. Go to section 5.2:
https://steamcommunity.com/sharedfiles/filedetails/?id=279488894
Are you getting any errors? If yes, the guide might have a fix for it.
Which version do you plan on keeping? Make sure the launcher says the right version (1.67 for Steam, 1.69 for Origin) and if the expansion packs are correctly shown as installed after you're done with reinstalling or verifying files on the version you kept. There's no difference between both versions.
I have an idea what I did wrong. I did 2 things wrong. I should have just had one going. The 2nd thing I did wrong was launching the game from different starting points. The day it was working, I think I launched it from Steam and the next morning I launched from Origins. I don't know why I thought these the game was linked to both.
Now, I can't even launch from either. But I also am unable to uninstall it. Because it still says I have stuff going on in the background. But, I don't know where or how to access this. At this point I don't care if I lose my save. I don't have any CC. I just created two new characters and their house. I can start over again. I'm just hoping I can get Sims 3 working again.
Uninstall from Steam, not from Control Panel. It makes no difference but you'll at least be more sure that you got rid of the Steam version.
Do you have any expansion packs? You did not mention if the save file was on a world that came from a pack. If yes, double check if you have redeemed every CD key on Origin. And then make sure those packs do show up as installed in the launcher.