bought computer with ubuntu program messed up

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http://askubuntu.com – i recently got a dell inspiron B130 with an ubuntu prgm on it and the main users desktop is scattered allover the place , files everywhere but not in folders,how do i fix this? i am new working with this operating system ,used to windows versions. if i go into a guest profile the desktop is perfectly fine and everything works but i cannot make the system fix itself or don't really know where to start help??????? i have the user name and password and can get to terminal screen , but not sure how to remove and add myself to admin use (HowTos)