Device Manager confirmed his fears: Unknown Device. The Ethernet controller was missing, but more importantly, the wireless card was dead in the water. He knew what was inside the machine—he had popped the back panel open months ago. It was a Broadcom BCM430n.
Broadcom Wireless LAN Driver - Windows 7 (32-bit) - Lenovo Support Broadcom Bcm430n Wlan Driver Win7 32bit WORK
It is highly recommended to download the driver from official manufacturer support pages like the Lenovo Support Site or the Dell Support Portal for system-specific stability. Installation Process: Device Manager confirmed his fears: Unknown Device
with administrative privileges (right-click -> Run as administrator). but more importantly
Look for matching Hardware IDs in Device Manager, such as PCI\VEN_14E4&DEV_4365&SUBSYS_2230103C . Installation & Maintenance