Have you tried to download the Dell Wireless 375 driver from the E6520 support page? I was not sure you tried that driver as you did not list the drivers you have tried. If that does not work, in Device Manager right click on the DW 375 and select uninstall. Then restart Windows and it will detect and load the proper driver. When you removed the original driver, did you send it to the recycle bin? If so you can restore that file. And if none of that works try the following site. It is the Microsoft Update Catalogue and a terrific source of a multitude of Windows drivers.
ReeX
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37 Posts
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January 22nd, 2019 02:00
I have fixed the problem updating windows 10 to v. 1809
JOcean
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12.6K Posts
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December 20th, 2018 12:00
Have you tried to download the Dell Wireless 375 driver from the E6520 support page? I was not sure you tried that driver as you did not list the drivers you have tried. If that does not work, in Device Manager right click on the DW 375 and select uninstall. Then restart Windows and it will detect and load the proper driver. When you removed the original driver, did you send it to the recycle bin? If so you can restore that file. And if none of that works try the following site. It is the Microsoft Update Catalogue and a terrific source of a multitude of Windows drivers.
https://www.catalog.update.microsoft.com/Search.aspx?q=Dell%20wireless%20375