Here's a FAQ document regarding PPPoE and non-Windstream equipment:
I would recommend testing those settings as soon as you can, and return the Netgear (if you can) if it doesn't end up working. It's entirely possible that the Netgear won't even work with Windstream. If it comes to that, bridge or forward your ports from the 4200 to another wireless router. I've personally not had good experiences with Netgear products.
Should you decide to get a different router and you're technically savvy, go for this: »www.roc-noc.com/mikrotik/routerb···-IN.html
I have one, and it's rock solid, extremely powerful, and it's cheaper than most of the other garbage from Cisco/Netgear/Belkin/etc.