Need help setting up a home Network i Windows 7 via a Netgear Router

[Miracus]

Before I throw my computer at a wall and have the dog piss all over it can someone please save me from my frustrating dilemma.

I have the following setup:

Router: Netgear 4 port Wireless N Router (Model: WNR3500L)
Primary Computer (most used): Laptop running Win 7 32bit Home on Wifi
Secondary Computer (least used): Desktop PC running Win 7 64bit Ultimate on ethernet
Third Computer (rarely used): Desktop running Win 7 64bit Ultimate on ethernet
NAS Storage: USB 2TB HDD Enclosure running on ethernet via NAS Dongle.

I have had everything on my setup working one moment and then not the next, quite frankly this has always happened to me when it comes to Windows Networking so either Windows Networking is just darn useless or I must always be doing something wrong and as much as I hate to admit it, it's probably the latter of the two.

So at the risk of sounding like a complete dumbass can someone please guide me through how they would successfully set up a network on hardware such as what I have listed above.

Cheers Guys & Girls