Can i use VISTA....!! plzzzzz help me.....................!!plzzzzzzzzzzz

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hey i have hp laptop....wel i m using it since 9 months ...m itz config does not suport wat vista wantz........!! wel mine is.. intel(R)celeron(R)M...!! processor 1.50GHz..!! 504 MB of RAM..!! physical address Extension........!! so can i use vista or not...........!! m much worid of it............plzz help me out...