Cannot Find Gateway Nv79 Ethernet Controller Driver

Ethernet

Ethernet controller missing driver to run internet, says that it should auto detect but doesn't and can't seem to - Marvell Marvell Yukon 88E8050 PCI-E question. Bought a Gateway Netbook LT25 loaded with Windows XP. Was told by the salesman that I could upgrade to Windows 7, so I bought the software. Since the ethernet controller is not.


I cannot seem to connect on Ethernet though Wi-Fi works OK. I have seen several articles about ethernet problems with Win10 and perhaps you can help me sort this out.
CABLING
First the network config:
Two notebooks, C and D are plugged into a switch and the switch plugged into the router.
Now, the cabling is verified to work because computer C, running Win7 connects just fine and if the internet cables are swapped, computer C still connects just fine.
Computer D however does not connect. I did some other things to redundantly check too, just FYI.
So cabling looks OK.
ROUTER
both computers have fixed (reserved) IP addresses in the router.
The router sees computer C
but not computer D
Just FYI, if I turn on Wi-Fi, the router sees D on WiFi, but not the ethernet.
PING
Computer C can ping D
Computer D can ping C
Computer C can ping the router
Computer D cannot ping the router
So, what's not working?
Some investigation suggested the following, all of which I tried with no better results:
- Update the network adapter drivers (already current)
- Winsock posible culprit, so NETSH WINSOCK RESET and reboot - no change
IE used to find and fix these things pretty well, but here we have EDGE. Perhaps I'll try to install IE. Connectivity diagnostics are where IE shined over Chrome and Mozilla.
UPDATE: IE 9, 10, etc. are not compatible with Windows 10. So, the connectivity diagnostics just not as good in Win10. I can tell I am getting tired, as it's getting hard not to swear.
UPDATE: Added a pretty picture.
Gateway

Gateway Wireless Network Controller Driver

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Cannot Find Gateway Nv79 Ethernet Controller Drivers

I recently purchased a Gateway NV79 Laptop with the Intel i3core. I noticed immediately that, when using wireless in my home, I only was able to transfer at speeds of around 7-9 Mbps, when the average speed in my house is about 24-25 Mbps. I went into Device Manager and noticed that the Network adapter was set at 802.11b preamble, and could not be changed (unlike in my other laptop here at home where I have the option to change it). I figured there was something wrong with the adapter, so I swapped it with an Atheros AR5007 802.11b/g WiFi Adapter. Same result. Figured there was some configuration issue within Windows that was causing the problem, and I had already planned to wipe the system anyways, so I did just that. I formatted the drive and installed Windows 7 Ultimate (64-bit). Still, with both Wireless Adapters, I get the same slow speeds and am unable to change it from b to b/g or b/g/n. I am now assuming it is a hardware issue (i.e.: motherboard), or a potential BIOS issue.
Has anyone here ran into this before and did you find a solution?
Thanks!
-JR