This message was posted on behalf of Intel Corporation
As you're already aware, the Intel® WiFi Link 5100 AGN has been discontinued and is no longer applicable for support.
While you can find the latest drivers available linked under our Customer Support Options for Discontinued Intel® Wireless Products article, this adapter only supports Windows XP*, Vista*, 7*, and 8* (it only has partial support on 8.1, using Windows 8* drivers). Your adapter does not meet the Microsoft* requirements for a Windows® 10 driver.
- Supported Operating Systems for Intel® Wireless Products
We understand that you were able to use it for a while thanks to the Windows® 10 generic inbox drivers. However, it's not uncommon for unsupported hardware to start presenting issues after further OS updates have widened the preexisting compatibility gap.
You could try the built-in network reset tool to see if it returns your connectivity:
1. Open the start menu and access your Windows* Settings (gear icon).
2. Open the Network & Internet menu.
3. On the main area, look for and select the "Network Reset" option.
4. Make sure to close any open programs and save your work, then select "Reset now" and wait for your PC to restart.
If this does not help, you could try reinstalling your operating system or purchasing an USB dongle for WiFi.
Windows® 10 has a very simple way to reinstall the OS back to factory settings (first install) without having to dive into any advanced installation. See the "Reset your PC" section in the Recovery options in Windows® 10 Microsoft* support article.
NOTE: Any links provided for third party tools or sites are offered for your convenience and should not be viewed as an endorsement by Intel® of the content, products, or services offered there. We do not offer support for any third party tool mentioned here.