How can i install two different operating systems on my computer?

The best way to experience it is using it as a virtual drive. You can do by installing the free virtual image tool like vmware or Microsoft virtual pc 2007. <a href="http://www.microsoft.com/downloadS/details.aspx?FamilyID=04d26402-3199-48a3-afa2-2dc0b40a73b6&displaylang=en" rel="nofollow">http://www.microsoft.com/downloadS/detai...</a> Once you install the virtual pc, you will need an image/iso mount tools like daemon tool: <a href="http://www.daemon-tools.cc/home" rel="nofollow">http://www.daemon-tools.cc/home</a> If you are a bit lost from these instructions try following steps on this page: <a href="http://www.makeuseof.com/tag/installing-windows-7-on-a-virtual-machine/" rel="nofollow">http://www.makeuseof.com/tag/installing-...</a> By going virtualization, you can keep your vista and still have windows 7 without losing any data.  more