I had the windows 3.7 wallet working but tried to switch to 3.9 and it won't sync. was stuck on three days. changed some shit, but now it won't go past 2 days
Download the blockain.
follow this guide and you'll be fine.
http://navcoin.org/guidesdoes anything get changed in the windows wallet when downloaded? All the changes are in the appdata/roaming/NavCoin2 folder, correct?
Correct! You might want to change your navcoin.conf with latest nodes but that is all.
However there seem to be some syncing issues with 3.9 wallet. I switched back to the 3.7 for now and wait for a fix