There is black screen on my display afetr the sturt up, can someone help me?

Q: I have laptop HP pavilion dv2000 and windows vista. When I Turn on my computer there is the start up, after start up where suppose to be windows vista, there is black screen instead with opened "My Computer" and nothing else! Can someone help me! Tell me what is the reason or/and what to do! Help me, Please! I count on YOU!!! I bought this laptop two months ago!!!

A: laptop and computer- http://compac.co.in/

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