Basically- HELP! A few months ago I switched to Verizon fios, which has been great in most ways. However, I guess it's the way my house is built, but I have no wireless range in the back 3rd of my house. I can't use my laptop in the back bedroom or a new PC that is in the rear upstairs office. I have purchased a number of products from the local Micro Center including; a D-Link Systems Xtreme N Gigabit Router;D-Link Systems Xtreme N Dual Band USB Adapter AND a Hawking Hi-Gain Wireless-300N Range Extender. So it goes without saying I am in for about $300. The two PC's located closest work great- 100% signal, etc. The laptop doesn't connect at all in the back room. The upstairs office PC has sporadic connectivity- 11 to 30% signal, and I lose connectivity all the time. What can I do next? Can I return any of these items and get the "correct" hardware?
Have a look at mains borne networking kit -- Homeplug is one type that comes to mind. Basically you plug in a unit at the router end and plug in one by the computer and you get quick reliable, secure, connection (that's the theory, anyway).
More expensive than wireless but probably easier to set up