The Sims 3 does actually run on Windows 10 as seen in this YouTube video. Please note that The Sims 3 is the original version and The Sims 4 is the older version. The Sims 2 shows the black boxes under Sims, that's a video card glitch.
https://www.youtube.com/watch?v=gVXx59QQoLA
I believe your PC's hardware is not up to spec. The Sims 3 requires at least a 2.0 GHz Pentium 4 on Windows XP or 2.4 on Windows Vista/7/8/8.1/10 so if you have a CPU speed slower than 2.0/2.4 GHz especially on Intel Pentium and Intel Celeron processors, the game will run slowly due to the lower speed.
