Since I'm a Sailor Moon fan, I gotta say, nice screen name, Sailor Earth!
I'm not sure what to suggest about solving your problem, though.

I'm on a Mac, so I'm not familiar with the data3.cab error.
You might try asking your question at the Electronic Arts tech support site.
They offer live online support for The Sims. The link to get to the tech support chat room is:
techchat.ea.com:4080/chat/world/html/start.html
They also have a searchable database on the site that might have information on your problem.
Sorry I can't be of more help! Maybe some of our forum's PC folks will be able to give you some suggestions.
Glenda