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Slow WAN connection on Win7 on 1 computer

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I have a Win 7 machine (Dell 660S) that when I go to testmy.net I get 39Mbps down and it's always been pretty rock solid in the past at around 115Mbps. I have a 100Mbps internet connection. 
I started by testing all the usual things (new cable, different port, deleted/reinstalled driver). At that point I thought maybe the card was going bad but I decided to try one more thing. I ran Linux off a USB stick and bingo speeds were at 115Mbps.
Before I reinstall 7 is there anything I can do to troubleshoot this to figure out where things are going bad?
Also, all my other machines on this network both wired and wireless easily are in the 110Mbps to 120Mbps range using testmy.net. If I use dslreports.com/speedtest I DO get a speed of 120Mbps on the Dell but that is a multithreaded test and from what I've heard not as good an indication of true speeds. If any of that makes a difference in figuring this out.

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Speed Test Version 15.9
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