Help needed to intsall centos6,5 alongwith windows 8.1 preloaded os

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http://www.linuxquestions.org – Hi friends , im trying to install centos 6.5 in h.p 15r036tu laptop,which has preloaded windows8.1, i have created a parition for centos. But when i try to boot from installation media the startx failed error and gui installation fails i feel like im making some mistakes on bios please help to rectify the error. Thanks in advance (HowTos)