Gigabit Internet Windows 7

Monitor the Windows 7 computer with Task Manager (better yet, Performance Monitor) to see what is going on.  Are the disk or CPU maxing out during the transfer?  Is the transfer speed bouncing up and down or staying consistently between 50 and 100Mbs?

Also, try copying large files between the Windows 7 and Windows 10 computers and see what sorts of speeds you get.

Is the Windows 7 machine older with a slower network card (100 Mbit/sec) ?  Try updating the driver on it.

The Win 7 is less than 3 years with all updates and drives current. The NIC is a Realteck PCIe GBE.

When I monitor the performance of the CPU it is not maxing out. When the download gets up to 900 Mbps the cpu is at 80% but when upload is at 100 Mbps the cpu runs less than 50%

Realtek is (usually) a software card instead of hardware. So that is why CPU goes up at higher speeds and if other stuff is running, that may cause speed to go down.

Your Windows 10 Machine probably has a hardware card (Intel) that is more independent of the main CPU

can you give me an example of a hardware NIC or are all intel hardware?

My laptops (Lenovo) use Intel hardware cards. You need to look at specs to see what other vendors are doing. You would need to ask your manufacturer whether you can replace the NIC with Intel

if its a laptop highly unlikely you will be able to change the nic, all nics are hardware--- it is the drivers that makes a difference ----realtek cards are known to be unreliable and buggy--- intel nics most stable and you'll get a better bang for your money. Then they are other factors that affect the speed, is your computer infected with virus or worms phoning home and eating up valuable resources, is your CPU multi-thread or single thread--- dual core versus quad core vs hyper-thread vs turbo-boost.

Are you using sata drives vs regular hard disk-- do you have a single stick a memory in vs all memory bank full with same type memory---what about FSB ( front side bus) if fsb is 800MHZ good luck trying to get gigabit speed from the machine...

In a perfect world quad-core--fsb 1600 or better--ssd drives--latest memory and windows 10 which is optimize to use all threads for multitasking will get better results on your speed test.

But most manufactures do not do that you will get hd disk and memory but crappy processor and lower fsb motherboard which does not function at optimal performance.

The issue here is 100 mb on a gigabit link.  It does not matter if the FSB is 800mhz, he should get significantly more than 100 mb.  Something is no right.

It looks like an issue with Windows 7. I upgraded the same computer to Win 10 and now constantly getting 900+ Mbps down and up

Windows 7 is slower than Windows 10 so that could be the reason. I stopped using Windows 7 before the really fast speeds appeared

interesting.  was this something that started recently or was it always slow?

I’ve never known windows 7 to be slow, something must be wrong

I had Windows 7 for 5 years and it worked well but Windows 9.1 was faster and Windows 10 faster again. Not huge gaps but faster nonetheless

never came to a solutions on this but I did find that upgrading the computer to windows 10 help on most of the computer. I still have a couple of compute that are not testing on gigabit speed. I have two Lenovo desktops, almost identical models, but one gets consistent gigabit speed. I have switch the two computers around to test wiring but still get the same results. All drives have been updated to the newest version.

Nobody raised this; but, what antivirus and/or anti malware software are you running? (and what version(s))?
Numerous packages will insert themselves into the TCP/IP stack and scanning traffic on the fly will slow things down.

Webroot

What site are you using to do your speedtest on?
If your using speedtest.net dont choose a the closest server just click start test.
Try this site also, shaw.ca/speedtest

I can't edit comment on mobile. This is the correct site.
http://speedtest.shaw.ca

If you have more than one computer, to test NIC performance, don't use internet speed tests, but rather use a LAN speed test such as iperf https://iperf.fr/iperf-download.php

When using sites such as speedtest.net and others, the test is the performance of the whole stack from browser through to ISP connection.

If "unexpected" performance is encountered with sites such as speedtest.net, it can be useful to retry using a different browser, and it always pays to monitor other network traffic to and from the computer running the speedtest.

I take it you are in Canada?
I just ran the test from your link and from the parent site ( http://www.speedtest.net/ ).  My upload speeds were about 20% slower using the Shaw link you posted; but, that is nowhere near as dire as what you are posting.
One user of Webroot; however, posted that things ran 8 to 10 times faster when he disabled Webroot's real time shield for testing.  Have you tried that?

Forgive me if someone already had you try this,  but have you checked your network card properties advanced settings?  

Especially :  

Speed & Duplex:   Usually set to auto, but can be set to 1gb Full Duplex
Flow control:         Tx & Rx enabled