Can you help  have samurai installed in VMware toolstation starts no problem when i type in airmon- start wlan0 it keeps saying command not recognized or aireplay-ng can you tell me what i am doing wrong please it looks like a cool machine help please many thanks colin.

Hi everyone i am hoping someone can help with this very annoying problem i am using backtrack 4 final it loads perfect the problem i have is when have done airomon-ng start wlan0 i get my chip-set then i type in airodump-ng wlan0 this bring up the client lists after it has searched it is supposed to return to btroot so i can continue to my next command but nothing happens is it because there is not enough signal as i am trying to hack myself thanks.