I deleted the wireless network adapter programm from my PC?

I deleted the wireless network adapter programm from my PC. I have a Lenovo notebook and Windows 8.
How can i install it again?
The only think taht i remember is that it was starting from "A".

You need to go onto the Lenovo website (support and drivers) and download your wireless adapter from there. You can use an Ethernet cable for now as your wireless won't work until the drivers are installed.