Davidnumeral

hi there i have recently formated and installed windows vista ultimate on to a dell dimension c501 and it will not load into windows as the bios is not dell itself and the hdd is run itself by the dell bios and i would like to know if anyone nows how to get past this

p.s i have never really delt with dell that much altho i am very familiar with formating and installing windows i do it several times at home

cheers for any help

david