Just FYI:
Wireless "N" has both 2.4 and 5ghz varieties.
Most PC / Non-apple hardware doesn't seem to support 5ghz, despite being "N" compliant (they only do N 2.4).
In my experience, 5ghz is pretty crap anyway, unless you're within 10 feet and have no walls between you and the AP - or there is a lot of interference/other APs around on 2.4ghz. 2.4ghz goes through walls FAR better.
edit:
I see you've got a netgear AP. I had one (a netgear wireless ADSL router) before my old Airport Express - the airport express gave me far better range (like, 3-4 bars where with the netgear AP i previously had 1 in the same location) and performance. YMMV of course....
Also: if you download netstumbler (or istumbler) - you'll be able to see how many wireless APs are around and what channel they are on. If you're on the same channel as a heap of others, change it and your performance will be better.
around my old house there were 11 APs on the default channel 1. I moved to channel 6 (aussie channels are 1, 6, and 11) and got way better performance.
i checked with istumbler. and on most the channels, i am getting 35-40% signal, 18-20% noise, using 802.11N protocol. wow. guess it does use n. why such bad signal???