Here's a clever Windows utility that allows Linux to run natively under Windows. I've used it to run Linux servers, X apps, and to compile stuff. Your entire Linux file system resides in an ordinary Windows file. http://www.colinux.org/
Yes, VMware is a popular product that can host multiple operating systems including Linux.
VMware is a commercial product. coLinux is free and open-source. **broken link removed**
also u can use vmware server consol so u can creat a virtual machine in ur pc and setup the unix or linux os or if u have an iso image for the os u can work with it throw the virtual machine u creat it
I think you can use a "live" distribution of Linux that can boot from CD, or use a virtual environment like vmware or better VirtualBox (hxxp://www.virtualbox.org/) that is free but you must install the Unix os in this environment or you must use a image than you can freely found on Internet.