Is it worth installing Ubuntu instead of wubi?

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http://askubuntu.com – I'm using wubi at the moment and my pc is really slow, is it worth deleting XP and formatting it to Ubuntu? Or (trying) to reset XP to factory settings? PS: I have over 40 GB HARD DRIVE and hate having xp on my computer... Thanks, DJ Porter MODS DON'T CLOSE THREAD YET PLEASE (HowTos)