Network Controller help!

I recently installed windows 8 preview. I had it for a while and decided that I didn't want it anymore. I realized that I couldn't go back to windows 7 because I didn't install it on another partition, so I temporarily downloaded a non genuine copy of windows 7. After doing this I realized that my wireless Internet was not working. I check my drivers and I had a yellow triangle next to my network controller driver. I then put in the cd that came with my laptop and tried downloading and installing the network controller driver. I did so and it still didn't fix the problem. So I used an Ethernet cord to get Internet and that works but my wireless won't work. Somebody please help. I've tried everything.