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→Try Ubuntu Without Installing it
To run Ubuntu from the CD simply place the CD into your CDROM drive and reboot your system. If your system reboots once again as Windows then it is likely you will need to change the boot order in your system BIOS. To achieve this restart your system and watch closely as the system boots. Early in the boot process the BIOS will display instructions to enter BIOS Setup (which often, but not always, involves pressing the DEL key). Press whichever key you are instructed to press and you should find yourself in the BIOS setup menu. Find the setting for the boot sequence, and if it shows your hard disk as being the first device to boot from, change this so that your CD or DVD drive appears as the first device in the boot order. Select the "Save and Exit" option from the BIOS main menu and allow the system to boot. As long as the Ubuntu disk is still in the drive you should find that Ubuntu boots instead of Windows.
Once Ubuntu as booteed has booted from the Live CD you can begin to experiment with Linux.
There are a few minor downsides to using the Live CD. The first is that performamce will be slow. This is because Ubuntu needs to load software from the CD drive which is orders of magnitude slower than a hard disk drive. Secondly , because the CD is a read-only medium you will not be able to create any new files or save any changes you may make to the system. One advantage of this is that you also can't break anything, so feel free to experiment as much as you like.
== Installing Ubuntu on a Disk Drive Containing Microsoft Windows ==
