Requirements

VMWare Workstation 6.02, VMWare Player 2.02 (freeware) or VMWare Fusion beta for intel based Mac's
Wireless USB with support injection packet.
Approximately 2Gb of hard disk space

Starting

Install VMWare Workstation or Player
Start VMware and select “open”. Open the virtual machine.
Open aircrack image use vmware
Attach your USB adapter.
If the USB adapter is recognized automatically you'll find a small USB icon in the lower right corner of your VMWare window. If not you have to attach it manually.