Windows 10 - Tried reinstalling the wallet once - will try again. Just to confirm the only folder needed is keystore ?
Yes,
Keystore has you account details in it.
Make sure the Ethereum folder in appdata has had the blockchain deleted from it.
Should you want too try out Parity instead of Geth:
This tutorial shows you how to use Parity on Windows 10.
https://www.youtube.com/watch?v=zOo3_aSXoZELatest Parity version is on Ethcore website:
https://ethcore.io/parity.htmlThe Keystore folder is simply called Keys on Parity.