[ERROR] Disk Authentification

This is a Sims 2 error that happened early on after the release... I'm pretty sure almost everyone has fixed it by now. It's generally caused by CD emulation tools, such as Alcohol 120%, ect. I suggest that you check out and follow the steps from the official EAxis page, here.

If this doesn't work for you, you may have to deviate from the regular (and the legal). I've talked to a few people who have managed to fix this error using a NO CD/DVD patch for the game. However, this isn't the greatest of fixes, due to it being against the law, ect., so I'm not going to tell you to absolutely go and do that, as I think it was fixed in one of the newer patches...

So #1 priority - patch your game. If it's not fixed after that, then try some other alternatives.