(no matter, but DNS and gateway is completely useless on netinstall)
Disable all network interfaces (wireless, bluetooth, vpn, something), not mind you think some interfacee not mind, except ethernet used for link to RB.
Use netinstall 32 bit, not mind if you pc is 64.
Keep button pressed when device is off, Keep button pressed when you connect power, do not release button until do not appear on netinstall. No matter how many seconds are needed. Obviously if you wait more than 60 seconds, something do not work.
If you have any switch, try to put the switch between (no matter if is 10, 100 or 1G)