start a terminal as administrator and try the following two commands (1st will disconnect your network, it's fine, will recover with the second).
It has helped me on numerous cases having net issues on windows.
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//Founder of
The 7th Circle [Private forums]
Eldebryn Rilynghym Let the
past crumble to dust. I have the Art... I, Magus...
Mage of Sshamath and teacher of the Art
Gaerdred Dawnfire Paladin of Torm, born and raised in Baldur's Gate