Sims 3 - Uninstall
This Game_Help:TS3_Uninstallwiki link has the step-by-step instructions to guide you through uninstalling The Sims 3, and its packs (EP/SP).
If you're reinstalling because you're reverting to an older patch, or just do not want to use the Launcher/EADM to patch, read this FAQ Game_Help:TS3_Patchingwiki once through before patching and then follow the guide.
A few things you can try before last resort of a reinstall.
- Bypass Launcher to test if directly starting the game give same error (Game Help:TS3 Bypassing the Launcherwiki)
- Rename user folders to rule out corrupted ones (step#3 in Game Problem FAQ)
- Try to repair registry (use tool like CCleaner - link in Uninstall FAQ)
Last resort: uninstall and reinstall, as most svc init issues means something wrong with the system not recognizing game files or corrupted game files.
You may however want to test uninstalling the last pack you had installed, before going the whole hog to base game. Sometimes, if you're lucky enough, only the last pack needs to be uninstalled/reinstalled.