Macbook pro won't connect to wireless network

hi, hopefully somebody could give me an advice!
i purchased a 13.3 inch macbook pro yesterday and i'm in love...except for the fact that it will NOT connect to my wireless network. i have been using a linksys WRT45G version 6 router for many years with no problems (currently have 3 computers linked to it - all pc's). i've updated the firmware but still no luck.
the macbook pro is able to see the network but can not join - it gives me a generic "connection failed" message when putting in the WEP password. i consider myself to be techno-savvy, but not with macs! i'm completely lost and equally frustrated. help, please!

Hi guys,
I seem to have a similar problems. It is starting to occur this afternoon and somehow i cant fix it.
I have just installed my Snow Leopard about 3 days ago... and it was working fine. This afternoon I had a problem with my modem, but after resetting it about 3 times it was working fine again. So i tried to connect to it wirelessly but it kept saying 'connection timeout'. It becomes really annoying at the point of resetting the modem to its factory default settings. But then, i tried using the ethernet cable. It seems to be working fine for now. I tried connecting it through my home computer 'wirelessly' and it seems to be working fine. What I am wondering now is that, why doesn't my MacBook Pro connects wirelessly? Anyone has any idea?
PS: I have tried changing the channel of my modem and it doesn't do much.
Thanks

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