Re: uninstalling windows xp
take your time making this decision ... make a live dvd and test Ubuntu on the pc for a week or so. Try to do your daily tasks using Ubuntu to discover whether you have all the tools you'll require. Of course if this is a 'second' pc and not your primary PC make a live dvd test for an hour then install Ubuntu to replace WinXP there really no need to uninstall Win because Ubuntu will blow it away for you!
HP | Intel iCore 7 3.2Ghz | 12 Gb mem | SSD Win7 | HDD Trusty
Dell laptop | Intel iCore 3 2.1Ghz | 4 Gb mem | Win 7 + Trusty