At the moment i have bt5 installed on my laptop but when using aircrack to retrieve my wpa key it takes forever. So i have downloaded the trial version of elcomsofts wireless security auditor and using a .cap file i downloaded off the internet my main pc with windows 7 storm though the cracking process.

the problem im having though is the .cap file i get from my own computer using bt5 doesnt seem to work with it.

"the file your tryi g to open is invalid. It is either not a valid tcpdump/ncf file or contains no wireless data"

Although using wireshark im pretty sure ive got a successfull handshake. But for some reason my .cap doesnt work.

Any help appreciated.