I have an HP 8100 Compaq Elite running Win7 that just recently downloaded the update KB4088875 which made the NIC unusable saying no hardware is detected. 3 other machines had the same issue, but they had restore points so I rolled them back and everything is working. But one machine has no restore points. Steps taken:
1. Booted into safe mode and deleted update KB4088875. Restarted and still no network connectivity.
2. Went in Device Manager and uninstalled the unknown Ethernet connection, restarted and plugged Ethernet back in. Still no NIC detected.
3. Attempted to download correct driver from a different laptop, and then using a thumb drive to install it on the broken PC.
4. The PC failed to open the thumb drive due to the fact it doesn't have the appropriate driver...