Sims 3 Not Launching

@divaisdancing  The default location for TS3W.exe in a Steam install is this:

Program Files (x86)\Steam\steamapps\common\The Sims 3\Game\Bin

Your dxdiag shows a number of crashes of Sims3Launcher.exe, but there are four different types of errors pointing to three different Windows resources.  It's worth running DISM and sfc again, just to be thorough, even though the first pass should have addressed any corrupt Windows files.  (And sfc told you it did just that.)

But the more likely issue is the data the launcher is trying to read.  I can't tell you why you'd have the problem now and not before, only that it happens often enough to be worth testing with a clean folder.  So if DISM and sfc don't help this time around, please move or rename the Sims 3 folder in Documents\Electronic Arts and see whether the launcher will open.  And if it doesn't, please let me know how launching the game from TS3W.exe goes.

@kris_blurryface9  Yes, the Steam version of Sims 3 works better than the EA App version for a few reasons.  However, you can't play through Steam unless you buy the game, and any packs you'd want to use, in Steam.  Also, Sims 3 is not going to "get fixed" at all unless Maxis decides to do a remaster or remake.  There is no Sims 3 dev team to fix anything, and the last update was released in January 2016.