If standard uninstall fails, download . Search for any rt640x64 , rt8139 , or netrt entries and delete them. This nukes old driver remnants.
Official support for the RTL8139 family generally ended with Windows 7/8. However, these cards can often still work on Windows 10 using the following methods: Go to product viewer dialog for this item. Realtek RTL8139D 10/100Mbps Ethernet Card - PCI realtek rtl8139 driver 810x family pci-e gigabit windows 10
: Sites like Driver Scape and Treexy host versions explicitly labeled as compatible with Windows 10 32-bit and 64-bit. Installation Tips RTL8139 - OSDev Wiki If standard uninstall fails, download