Unable to install xp on compaq CQ50-106AU model

hello sir i have COMPAQ CQ50-106AU laptop . sir my laptop had come with free dos environment and than i had installed xp on it but sir one day i installed vista in it and downloaded all the supported drivers from hp site , but sir when i was installing drivers for vista by mistake i updated my BIOS , and after than when i try to install xp my laptop will completely turn off. but it will not turn off while installing vista. with this problem sir 1 more issue is created is that i have 2 .iso images of EA SPORTS CRICKET2007 every time i load image with demon tools and had installed that game , but after having this xp installation problem whenever i play that game on xp in my laptop , laptop will get turn off but sir if i install that game of vista , laptop will not turn off . i was using this game very fine on xp in my laptop . please sir help me.