I think here is the updated driver if you still use the usb wireless thumb device:
http://www.realtek.com.tw/downloads/downloadsView.aspx?Langid=1&PNid=14&PFid=55&Level=5&Conn=4&DownTypeID=3&GetDown=false
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Windows plug and play will reinstall the device from the hidden driver store on your machine a few seconds after you uninstall the device. You will want to remove the device driver from the driver store (or disable plug and play while you update the driver)
here is how to remove a device from the driver store
https://technet.microsoft.com/en-us/library/cc730875(v=ws.11).aspx
often for a device driver like rtwlanu.sys you want to check the date of the file. This is a usb wifi driver so it depends on the USB support in your BIOS and the cpu chipset drivers and the USB 3.0 chip drivers that might be installed. To have it work correctly you want to update these from your motherboard vendors website. (and make sure your rtwlanu.sys is dated after 3/1/2010 if you plug into a usb 2.x port, or after 4/1/2013 if you plug into a usb 3.0 port.) (often it will be too old if you upgraded from windows 7 to windows 10, and the old one will not work correctly with the new windows 10 usb support)
since it is a usb driver, it can be associated to your port, when the device is removed from the system it will become hidden rather than removed.
you can have them displayed in control panel->device manager select view, then click on show hidden devices.
if you remove the driver package from the driver store, you then can uninstall the driver using device manager and it will not automatically get reinstalled.