UKkennybrown These errors are almost always antivirus-related, and it's common for the game to work once after a reinstall, before the AV flags it again. If you don't want to reinstall yet again, try disabling Norton, temporarily of course, clearing the EA App's cache, and repairing. Once you've done that, launch the game once with Norton still disabled to confirm it works.
If this does help, reenable Norton, and before launching the game, set exceptions for TS4_x64, TS4_DX9_x64, and TS4_Launcher_x64, or the entire Bin folder they're in. Set an exception for EADesktop.exe as well.
