no..i don't have aircrack because i'm using windows 7.. futhermore, i don't think i need aircrack to use cowpatty for windows.. i'm just ran packet capture from faircrack to my wpa wireless..then, after a got wpa handshake on the right corner of xterm, i transfer the .cap file to my windows and start cracking using cowpatty.... but why it said that "incomplete TKIP four-way exchange. Try using a different capture".... so, i try google my problem and i found this.... ........................ When you filter the EAPOL handshakes in the WireShark, you will see that they all originate from the client and go TO the AP. There are none FROM the AP. IE You only have 50% of conversation. That is why aircrack-ng says you have no WPA handshakes. As well, if you look at the packets in the two captures, you will see that it really only the client packets going to the AP, not the reverse............. .................................. unfortunately, i don't understand what it mean....