If you're not good then I'd just reinstall it. Takes just a half hour or so and it's all be good as new. Hell they just came out with a new xubuntu you should put that on instead. It'll likely run faster also. xfce is a great desktop environment.
everyone has their own favorite flavor of linux, lets not scare the guy with flavors he knows nothing about. a fresh install for what he is familiar with is simple enough.
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