Ubuntu is a free linux-based operating system. Ubuntu works very well on Virtual PC, and I didn't encounter any problems during installation. A detailed step-by-step explanation can be found on the documentation site of Ubuntu, How To - Configure Ubuntu for Microsoft Virtual PC 2004.

Setting Ubuntu to the same screen resolution as the host in full-screen mode didn't worked for me. I tried the following post, but without any success.

One of the reasons for installing Ubuntu, was to see if my blog site rendered correctly in Firefox. Only the line under the post title was not positioned correctly. I will update the 'business' theme soon.