Slow internet speed when using AirPort

Hi
I guess this may have been discussed before, but I could really do with some clear advice on the subject. I own a 2007 Mac Pro with an AirPort wi-fi card fitted by Apple as an option when I bought the machine. However, for some time now, I have experienced problems with my wi-fi connection when on the net.
Firstly, there's the signal. When I switch the computer on first and then access the internet, all four bars on the AirPort icon on my desktop are in black. However, after a while this starts to drop to three or two - sometimes even just one. The connection speed to the net decreases as the bars drop. When all four bars are filled in black, my connection speed is still not very good. My Mac Pro is not really far from my AirPort Extreme - in fact I have tried my old Windows XP based laptop in the same room and it appears to be fine provide better access speeds (even though it's an older machine)!
Secondly, my Mac Pro doesn't seem to like my 8 digit WPA-PSK security key on my modem (accessed through the AirPort Extreme base station). When I disconnect and try to re-connect to my network (as sometimes this helps my connection speed when it's low) the Mac asks me to punch in my key. I do this and it never seems to recognise it. Tried changing the password key through my modem's settings via an ethernet cable, yet still - when asked to type in the key when trying to access wirelessly - it is not recognised.
Can anyone offer any advice?? I have a Netgear modem/router with an AirPort Extreme 802.11n base station. I purchased my Mac Pro June 2007 from Apple.
Thanks

07-Nov-200710:32 AM
android wrote:
Maybe you haven't noticed that transfering or loading software with cable connections much faster than bluetooth. It's something todo with handshaking in laymans term.
WIFI nor WIMAX can't even come close to speed of wired networking!Message Edited by android on 07-Nov-200710:35 AM
I know cable connection is faster than bluetooth. But BT connection shouldn't be that slow.

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