I presume you mean Ubuntu. I have just done this so here is what you do. You can either go on line and order a free CD which takes about 2 weeks to come or download the program from the internet. It is about 700MB so don't attempt this unless you have broadband. The download includes the free Office package and many other wonderful programs like Gimp. The file comes down in ISO format which you then need to burn to a CD yourself so it is useable. There is a great little free program you can download to do this called Infrarecorder or you can use Nero. I have both and found Infrarecoder to be the easiest to do this with. Once you have your CD written the rest is a breeze. Just install the cd in your player and off you go. Everything is automatic and you can go away and leave it until it is finished. It can take about 30 minutes or so depending on your PC. There are lots of Ubuntu helplines to get you started but the one thing I immediately found was that it was exceedingly fast despite being in a 6 year old PC. It was no good for me however asit will not work with my USB modem ( a common problem with most USB modems but their is a solution if you don't need your modem for anything else. I will put it on another older PC like you wish to do while I give it a good try but it certainly looks impressive. It will dual boot quite happily with XP but beware that getting rid of the dual boot choice if you remove it is not so easy as the GRUB as it is called can be a little difficult to remove. Not impossible just a little difficult. Hope this help.