I have Knoppix ISO (690MB) on a CD. This is the only file on the CD. But it doesn’t boot PC. Do I need to have any extractor on the CD or extract the ISO files on CD or hard disk? Boot order of PC is O.K. If there is any other better ISO, preferably a smaller one in size, please inform that too as I have never used Linux. Does the PC setup require any changes to run Linux as currently I am using XP?