Very old and discontinued, and not supported on Windows 10:
https://www.intel.com/content/www/us/en/support/articles/000006507/network-and-i-o/wireless-networki... Customer Support Options for Discontinued Intel® Wireless Products
https://downloadcenter.intel.com/download/27050/Wireless-Intel-PROSet-Wireless-Software-and-Drivers-... Download Intel® PROSet/Wireless Software and Drivers for Intel® PRO/Wireless 3945ABG Network Connection
Why did it work before your latest W10 update? You were lucky. And, you can expect this from Microsoft with older hardware.
Also, this is the reason why: https://docs.microsoft.com/en-us/windows-hardware/drivers/network/wifi-universal-driver-model WLAN Universal Windows driver model | Microsoft Docs