I guess my first question would by why is that url there to begin with? If you are paying for hosting what is their domain name doing in your url's? Short of changing hosting (that is what I would most likely do) maybe a 301 redirect from the pr3 page to the one it "should" be?
I am sure someone else can offer a better suggestion.
I for one would not be very pleased with the host. Is this a free host? It kind of looks like using that structure, like a free Wordpress site would have that extra touch in there.
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"People who are unable to motivate themselves must be content with mediocrity." ~Andrew Carnegie~