Not quite sure what to suggest, but I had some problems until the other day....
This is what I did - hope it helps...
1: I tried the version from this site - but for me it didnt work.
2: I used unSafeDisc on the Living Large/Living It Up files.
3: I then used CloneCD to *cough* back-up *cough* the original.
Prior to this, I also used CloneCD to back-up the original Sims game.
From here I installed the original game from the back-up CD, and left the files as they were.
Next I used the Living Large/Living It Up CD to upgrade/update etc, finally, I replaced the 'Sims.exe' with the one created by unSafeDisc.
Tested it, and it all worked fine....
Tis a miracle I tell you...a miracle
Hope this helps as I'm not quite sure what is causing your error etc...