Have a look at these links to see if they'll be of any help.
Game Crashes (CTD)
http://sims3.crinrict.com/en/2011/01/error-game-crashes-ctd.htmlGame Help:Sims 3 Crashing Checklist
http://simswiki.info/wiki.php?title=Game_Help:Sims_3_Crashing_ChecklistBlack screens, crashing or freezing in Sims 3?
http://help.ea.com/en/article/black-screens-crashing-or-freezing-in-sims-3-try-windowed-mode/However if none of the above help, you may need to uninstall all of Sims 3 and reinstall.
You mentioned it crashed during the update. It's possible some of the game files were corrupted.
After you've uninstalled all of them. Run a registry cleaner program. (Something like Ccleaner, It's free -
http://www.piriform.com/ccleaner/download)
This helps clean up temporary files, internet cache files and other files that are left behind that are no longer being used, after uninstalling.
Running Disk Cleanup and Defrag are helpful to do as well.
-- All Programs > Accessories > System Tools > Disk Clean Up
-- All Programs > Accessories > System Tools > Defragmenter
These paths were made with Windows 7 in mind, so they may or may not be the same in Windows 8. These programs will help clean out the unnecessary and temporary files on your computer and reorganize your hard drive to make it run smoother.
Optional - Restart the computer.
Start reinstalling your Eps and Sps, Let the installer patch as you go. Start with The Sims 3 Base Game and go from there.
As for how to check to see if your antivirus has quarantined Sims 3. I'm not sure. It'll depend on what your antivirus program is. If you can find that out, I might be able to search that out for you.
You can save your saved game files and such too. So you can still play your dynasty game.
How To: Saving folders/files to use on a different computer or to use as backup
http://www.carls-sims-3-guide.com/forum/index.php/topic,16414.msg313134.html#msg313134I hope some of this helps
MrsFlynn