There are things called No-CD Cracks. But the problem is, they can be legal and illegal. Check out this topic.
It does say in many countries(not specified) that you can legally use no CD cracks providing you have the legit copy. It would become illegal if you don't own an original copy.
So as long as you keep the original CD and have the key with it, it should be fine to use. (I say "should" because it doesn't state specific country laws for it)
Google for "Sims2 No CD"
Personally, I don't give a crap about what I use on my PC. But this forum does have rules so I'm just being careful about what I say :)
PEBMAC - The biggest cause of Computing problems.
Damn ID10T Errors.