netsh interface tcp set global autotuninglevel=highlyrestricted
netsh interface tcp set global rss=disabled
and then from here
http://www.techsupportforum.com/networking-forum/protocols-routing/248812-wireshark-question-tcp-checksum-offload.html
towards the bottom
A guide:
1. Open Device manager (right click “Computer” and click “Manage”)
2. Click on “Device Manager”
3. Expand “Network adapters”
4. Right click your network adapter mine is called “Nvidia nForce 10/100/1000 Mbps Ethernet” etc.
5. click “properties”
6. click the tab named “Advanced”
7. Find “IP Checksum Offload” and click it
8. Put the value to the right to “Disabled”
9. Find “TCP Checksum offload (IPvX)
10. Set the value to the right to “Disabled”
Plus to be on the safe side I disabled also
UDP Checksum offload for IPv4 and IPv6