Ok, I have been getting this alot in our workshop. The PC game by EA (Electronic Arts), The Sims 3 does not update and gives the following error on Windows XP, Vista or Windows 7.
Heres how you fix it…
1. Disable your antivirus/firewall (Kaspersky, Avast, Avg, Norton, Mcafee, Etc).
2. Now install that update.
It turns out that the way to old style patch system works that EA though so hard about using for the last 50 years, has problems with almost all security packages due to the way it changes files. Most security packages will detect that action as odd and protect the files being patched. Simply turning off your AV until the patch has completed will let you update your game.
On a side note, please remember to re-enable your protection after.