powerbook can't connect to Belkin Router!

Hi, I've just bought a Belkin wireless G Router..got it installed on and connected on my pc fine..however when i've gone to connect via my powerbook airport..it says unable to connect..i've reset the 128-Bit wep password but still no good..tried changing it to 64 bit but that still doesn't work..

Doea nyone have any ideas..as the last thing i won't to do is phone the help desk!!

Simon

Also note i can connect successfully if my security is turned off on my Router..so this is leadin me to believe it's a mac thing! Any ideas