Common issue on modern Windows (10/11) due to SecuROM DRM (blocked by KB3086255) and 16-bit installer components.
Setup.exe / AutoRun.exe → Properties → Compatibility → Run as Administrator + Disable Fullscreen Optimizations.TSData\Res\CSConfig\Graphics Rules.sgr and TSBin\Sims2EP9.exe (main exe) with patched versions.TSBin\Sims2EP9.exe — allows >2 GB RAM usage (prevents crash on large lots).Setup.exe from disc1 folder.Community hub: ModTheSims / r/sims2help — comprehensive modern fix guides.