Sims 2 Mansion & Garden Stuff HELP!!!

Hello I have been trying to install The Sims 2 Mansion and Garden Stuff on my laptop for some time now. I have Windows 7 OP and I've been able to get all my other Sims 2 games to work but this one isn't working. The problem is that whenever I put the Mansion and Garden Stuff disc into my CPU it says to please insert disc number one. The game only came with one disc and it doesn't mean the Sims 2 disc or any other disc one. If someone could please help me with this then that would be greatly appreciated. THANKS!!

- Nathan