Networking card isn't working after reverting back to win7 from win8  

So dad bought my mom a new laptop for her birthday. Of course it has(had) Windows 8 on it. She did not like it & we have a copy of Windows 7 Ultimate on hand to reformat the laptop. Well everything has gone well on the install for windows 7. Everything seems to be working except for the wireless card. I will update this post if needed because I don't remember the particular model of the Toshiba laptop but when I talk to my dad I will get it posted asap. I do have a parts number. P/N:PA3839U-1MPC. I have tried to look around for different drivers & what not but no luck so if someone could help that would be awesome. No rush but the quicker the better would be great. Thanks in advance.

Thank you for such a quick response. The site you directed me to worked just fine. :) Very much appreciated & thank you again.