Wireless network issue. please help

[sic6six]

My g/f has brought her first wireless router and a wireless usb adapter(plugged into pc)
They are both netgear
Router is a Rangemax. Model DG834PN
USB Adapter is also a Rangemax. Model WPN111

The problem is it is only running at half the speed when it is supposed to run at 108mbps, where as ity is only running at 54mbps.

Can any one give any guidance as to how to get the speed up to its full potential.
(oh at the moment, both router and adapter are in the same room as she was testing them out, the computer will be moved later on)

Also she has a laptop with onboard Wireless and has some problems with MSN messenger disconnecting itself and the same with games. any assistance would be gratefully apreciated

Sic6siX

 

[sic6six]

where do i check that out.
and yes the WPN111 is 108mbps

(apologies to the admin too for using my g/fs account. she was on her laptop cuz pc was off and her account was already logged in)

 

[sic6six]

not to sound arrogant and ignorant but what exactly am i looking for as that doesnt really help much.