HP EliteBook 8460p Wifi Issue

Hello Everyone. I have a Notebook HP EliteBook 8460p. I installed windows 10 in it few days ago which worked perfectly fine. The wifi was working fine too. But because i could not run a software in windows 10, i had to install windows 7. In windows 7 it wasn't showing any wifi names or infact the wifi column. In the control panel also there was no wifi adapter showing. I installed another windows 7 but it was the same problem. I downloaded drivers from HP website but they could not be installed because of some error. I tried connecting the laptop through lan cable but it did not connect again as well. It wasn't showing any connection. I installed windows 10 again, and the wifi problem is gone. Can you guys please help me how can i fix this wifi issue in windows 7 because I have to run a software that is compatible with windows 7 not 10. Thank you so much guys.