Resolved Dual boot Internet connection only working on W10 when booting up

I am dual booting W10 pro and W7 Pro succesfully. I just changed EE internet provider for BT Smart Hub 2, and the speed has gone from 12 Meg to 54 Meg for very little extra money.
W10 works as it should and connects to the Internet at start up every time.
If I boot into W7 however it does not connect, the only way I can get it to connect is by going into Device Manager, clicking on the properties of Realtek PCIe GBE Family Controller (says This device is working properly) and toggling between Speed and Duplex, 1.0 Gbps Full Duplex, and Auto Negotiation. The setting stays the same the next time I boot into W7, but it will not connect until I change it to the other setting. It then connects almost immediately.
I can live with it but it is just very annoying, and a solution would be good.
Thanks for looking,
Regards
David D

 

Thank you Steve. Both OS were connecting fine with the ISP and a net gear router. This seemed to have happened when I changed to BT and their router.
On boot up W7 Network and sharing centre says Unidentified network,

This morning On troubleshooting the Red Cross on the basic network info, it comes up as Problem found, local area connection does not have a valid IP configuration. Fixed. Now I have internet connection, until I reboot back to w7 when I have no connection automatically again.
Network card drivers have not been changed, and come up as up to date.
Thank you for your help,
Regards
David

 

Thank you for your time Tony. I will investigate tomorrow,
Regards
DD

 

Tony,
I started on the commands. netsh int reset all came up as command not found, so I didn’t go any further.
David

 

Thanks Tony. I did as you suggested (I think so anyway) but on reboot the changes seemed not to stick, and it came up as before, and would only connect after troubleshooting the connection.
I appreciate your time.
Regards
David D

 

Thanks again Tony,
I uninstalled the network adaptor. Rebooted into W7 and it installed device driver software successfully.
The task bar internet icon came up with a yellow triangle, ( as previously) saying unidentified network.
Network and sharing center basic network info showed in the middle, unidentifiable network, and then a Red Cross to is right.
Just below unidentifiable network showed Work network. (changes to home after troubleshoot connection)
I clicked the Red Cross to troubleshoot, and it fixed the problem found ((LAC does not have a valid IP config). It connected immediately, and showed “network 3 Home Network in the sharing center.( was unidentifiable, and work network)
Rebooted into W7, task bar icon searched for a while but came back to yellow triangle, and N&S centre was back to unidentifiable network, Work network. (Clicking the troubleshoot Red Cross stills get me connected though)
What I need is a SAVE button somewhere !!!!!!!
Regards
DD

 

https://realtek-download.com/wp-content/uploads/2020/10/Install_Win7_7134_09222020.zip
I installed this (7.134.723.2020 from 7.46.610.2011) and it showed up in the device manager driver page for the card. I rebooted into W7 twice, and each time W7 connected to the internet as it should. Even though Device manager said the driver was up to date, it was obviously misleading me. So it looks like you have solved the annoying problem. I have learnt a lot trying to get on top of this, which is always a plus.
I am very grateful to you both for your time and help.
Very best wishes and keep safe,
David D