Question Dual boot sys, linux D/L speed full, Win 7 D/L speed 1/4

[TomLife]

I have a dual boot system, Linux mint 18.3 cinnamon and Windows 7 ultimate SP1 both 64bit.
On Linux I'm getting full download speed. On Windows I'm getting 1/4 download speed. I've tried different NIC drivers to no avail. Is there a known problem with Windows 7 Networking code or any malware that results in such reduction in D/L speed?

 

[RememberThe5th]

Have you tried changing the negotiation speed?
Windows does that sometimes from full 1Gbit to 100Mbit, usually found in properties of the lan via device manager or the adapter settings.