My compaq laptop only gets to log in screen. PLEASE HELP!?

I have a 4 year old compaq laptop. Windows vista. When I turn my computer on after I log in with my password it takes me to a black screen where all i can see is my mouse. What do i do now? My computer is not wanting to work. I would like to make it how i first got it and delete everthing i have on it and start... show more I have a 4 year old compaq laptop. Windows vista. When I turn my computer on after I log in with my password it takes me to a black screen where all i can see is my mouse. What do i do now? My computer is not wanting to work. I would like to make it how i first got it and delete everthing i have on it and start over wth it. What can do for both those things?
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