New Linux User, GRUB error 17

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http://www.linuxquestions.org – Hi, Just installed Linux on an external hardrive on my laptop. All went well until attempting to access Windows XP on my internal HD and got the the following msg: GRUB loading, please wait... Error 17. My fear is it overwrote my XP. Also once on the Ubuntu, was unable to access to the internet with my WIFI. any help would be greatly appreciated. Paulie (HowTos)