Aircrack returning wrong password ?

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http://www.backtrack-linux.org – Hello all, I'm a first year "Networking & Administration" student. My father has kindly allowed me to try and crack the encryption on the smaller non-significant kitchen WiFi network in his company office. I wasn't told what the password is but we bet that If I was able to crack it my pops would pay my next semester. I realize that similar introductions are not really relevant to the problem, but I just wanted to highlight the fact that I'm not doing anything illegal. Straight to the problem. Since the network is WEP-encrypted, I'm running the most common pattern: Quote (HowTos)