rt640x64.sys
Realtek — Realtek PCIe Gigabit Ethernet driver
When blamed in a crash: Very likely the true cause
What to do
Realtek's wired Ethernet driver — a frequent 0xD1 offender on old versions.
- Get the newest Ethernet driver from your motherboard/PC maker's support page (preferred) or Realtek.
- If crashes happen around sleep, disable 'Wake on Magic Packet' and adapter power saving in Device Manager as a test.
Official download (the vendor's own site — never use third-party "driver download" sites):
https://www.realtek.com/Download
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