New
#11
(my point precisely<g>)
I can't help thinking that there's a problem there somewhere.
Please look in Device Manager, and enable 'Show hidden Devices'
UNINSTALL (not just disable) all yellow or red-flagged devices - and ALL the RealTek Ethernet Adapters.
If anything doesn't want to uninstall, reboot to Safe Mode, and try from there.
Reboot to Normal Mode, and let Windows reinstall anything it thinks it needs to - make a note of any that cause problems.
Then re-test.