you are not looking for EigenBrower, you are looking for EigenD
it should be in your program files, under a directory Eigenlabs.
when you start EigenD , you then need to load a Tau setup… nothing will appear to happen until you do this 
so just pick the Tau factory setup.
(you can then select to load this at startup, so its automatically loads when you start eigend)
what is the colour of the LED on the basestation - solid green?
the green flashing on the tau, means the basestation has connected to the Tau.
this should disappear once you start EigenD - which Im assuming it doesn’t.
this means EigenD is not ‘finding’ the tau.
which is not surprising, if you say you cannot see it in Device Manager!
ok, so two thoughts:
a) hardware related e.g. bad usb cable or similar…
I would have thought even if the eigenharp device driver was not working, you would still see USB device (basestation) in device manager … though it would probably be labelled as ‘unknown’ or similar.
… so check to see if you have device that appears/disappears in device manager as you turn the basestation on/off - if not, then Id look at the USB cable, or try a different port on your windows machine
b) device driver related
make sure you check (a) out first, as otherwise you’ll be wasting time not this step 
so when you turn on the basestation, from memory you usually get a notification of a new device appearing - this is the basestation
then when you start eigenD and load a tau setup, then another notification appears saying its got a new device. (the tau being spotted)
(… its a while since I last installed the drivers, so I might be mis-remember this, and might be different on different versions of windows - but I think this is generally what you see)
but for some reason, sometimes the Windows device driver appears to fail to install properly,
ie. it’s there, but it just doesn’t detect the basestation.
(unfortunately I dont have the device driver source code, so I cannot find out why this happens)
so if you have proved (a) is ok, then try to uninstall the driver and repeat.
I usually found doing it a 2nd time resolved the issue, the I admit, its something Ive not done a huge number of times, since once it starts working - its seems ok!
(and newer versions of the EigenD software do not need a new driver install)
@NothanUmber has the most experience here of using/install EigenD on windows, so he might have something to add to the above…
otherwise, if you still have problems, I’ll see if I can get some more specific advice by playing with my Windows 10 setup.
EigenBrowser, is installed with the main EigenD package, and is generally accessed thru the EigenD menu I thought it was still ok on Windows, unlike the mac… but I don’t use it, Like Duncan , I do all my setup directly in Workbench