Sims 3 Installation Issues

I've downloaded and extracted the sims 3 and mounted both iso's onto my computer, when I run to install it works but then asks me to browse for a file straight after putting in the key code. When I click on the iso disk 1 for sims 3, there is nothing for me to click on, all files are there but nothing opens! What am I doing wrong? Ahhhhhhhhhhh   (It's currently 4:59am and I'm pulling my hair out over this).



Mod edit: moved to the right section.

- The_gh0stm4n