Can I reformat a Windows PC hard drive and install the Ubuntu Operating System

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http://askubuntu.com – My daughter gave me her old PC, and I reformatted the hard drive with my own XP System Disk. However, if I don’t activate the license, which I can’t, it will self-destruct within 30 days. If I download the Ubuntu software, can I burn it on a CD and re-format the hard drive, and also install the Ubuntu operating system on the hard drive? Will that CD have accessory software applications included, e.g. a word processor, a spreadsheet, a video player, video editor, photo application, etc., as indicated on your website? If I can't get Internet access on the Ubuntu PC would I be able t (HowTos)