1. Download the Backtrack 2 iso
http://www.remote-exploit.org/backtrack_download.html
2. Open VMware Workstation and create a new virtual machine
File > New > Virtual Machine
Click Next
Select Typical, then click Next.
Select Linux, then select Other 2.6.x Kernel from the pull down menu. Click Next.
Name your virtual machine Backtrack 2, or whatever you wish, then click next.
Choose Use bridged networking if [...]