@ohitsshannon_90 , there are some problems that can occur when trying to install the game. What I would advise is to install Base game first and use the 4GB patch on it. If you have other Expansion or Stuff Packs besides Pets, to install them in release order as Sims 2 is an older game that requires you to install in order so that the game may build on itself. Also make sure you have installed Graphics Rule Maker so that you can update the Graphics Rule.sgr file to recognize your video card. So here are the instructions on an alternative way to install Sims 2.
1) Insert your Sims 2 CD/DVD into your disk drive and open up your local hard drive.
2) Go to File, New Folder and create a new folder. Name this folder "Disk Images."
3) Open the "Disk Images" folder and create another folder called "Disk1." If you're installing a version of The Sims 2 or an expansion or stuff pack with multiple disks, create folders for each disk. Label them "Disk2," "Disk3" and "Disk4." *Note* It's important that you do not put a space in between "Disk" and the number you use.
4) Open up "My Computer" and select your Sims 2 CD. If the autorun comes up, cancel it as well as the installation.
5) Right-click The Sims 2 CD. Click "Explore." Make sure you can see the contents of the disk.
6) Click on the "Edit" tab at the top of the window and choose "Select All." You can also press CTRL+A.
7) Click on the "Edit" tab again and select "Copy." CTRL+C also works.
8) Open your "Disk1" folder. Go to the "Edit" tab and select "Paste." CTRL+V works as well. Continue until you've copied and pasted the information from all the disks into their appropriate folders.
9) Find the autorun file in the "Disk1" folder and double click it. This should install the game as normal. When you are finished, you can delete the "Disk Images" folder.
Tips
If you encounter any file transfer errors when copying and pasting, try cleaning your disk. If that fails, your disk is either scratched or corrupted.
Please keep me updated on your progress.
