problem in booting after installation ???

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i have A1524N Hp media center desktop ..i am trying to install window proff in it ..the setups process went good and it says after restart ur setup will continue ..but when it restarts it comes again on setup menu again ..and everything start from the beginning once again ..i checked boot sequence it was on cd then hard drive ..so i removed cd from cd Rom and changed boot sequence to hard drive first ...but its not booting ..could anybody help me in that ..when it restart it shows a msg to go in confirgaration menu ..so i had tried everything in that menu ..but did't help ..could anybdoy suggest me how can i boot my computer now ..thanks in advance ?? i have tried customer service and he said ur cd is busted..so i tried another cd and same thing happened ..plz help ???