@datboilizzy
To ensure I get it right, I am typing these in command prompt as I write this.
When I open command prompt as admin, it says
C:\Windows\System32>
I type cd ..
It now says C:\Windows>
I type cd .. again
It now says C:\>
I type D: ..
It now says D:\>
I type cd TSBin
It now says D:\TSBin>
I type Start Sims2EP4.exe
It should launch Sims2EP4.exe (the pets exe)
I don't know if the game can install through this. But if you can't find autorun.exe, it's the only other option I think.
If you have found autorun.exe and want to use it, type cd.. until you are back to -
D:\>
Then you type Start Autorun.exe
It should then say D:\>Start Autorun.exe and it should start.
If neither of these work, I'm entirely unsure of what else to suggest. I don't know how autorun.exe could be missing. Did you buy it used from someone? They could have deleted something on the disk, accidental or not. I checked my Pets disk that I have just to make sure there's meant to be an autorun.exe file and I found it.