Loss of internet connection from windows side of imac duo core

I have cable modem as internet hookup. When I am in Mac I have no problems, but every time I either change to the Windows side, or the computer is turned off or goes off, when Windows comes up, I can't access the internet.
I have gone into control panel and it states that the cable modem is unplugged or not connected. I then have to literally unplug the cable from the computer, wait a few seconds and then plug it back in.
This has been going on several months and started after I had a cable issue at the house and the cable guys came out and fixed it. they changed some things on my computer.
I think something on the MAC side was actually changed and that is impacting the windows side.
Prior to that I could access the internet from either side w/no problem.
Now, even if I unplug the cable and then plug it in, the computer is not recognizing that the cable is plugged in. As you can see, I am still having NO problem w/the MAC side.
Any ideas what command or default setting might have been changed to impact the Windows side in this fashion. thanks

what is the firmware version on the router?? try reducing MTU to 1452...let me know if you have any issues will get back to you.
thanks

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