@Haanbeii What did you do specifically to get Origin to work? The ...7b error is common these days, and usually resolved by reinstalling a number of VC++ runtimes. But if you did a complete reinstall, perhaps you removed the one that's essential for Sims 3 and didn't replace it.
On that note, click the Windows icon in the lower left corner of your screen, select Settings > Apps, scroll through the list to the Microsoft Visual C++ Redistributables, and see whether you have the 2005 x86 version. (This is the one TS3 uses.) If you don't, you can download it from here:
https://www.microsoft.com/en-us/download/details.aspx?id=26347
(You don't need the _IA version, which is for servers; or the _x64 version unless you have another program that uses it.)
If this doesn't help, please describe what happens when you try to launch Sims 3. It would also be interesting to know the other games that no longer work.