I'm pretty sure since you have a HP you have Pheonix bios. Go into it by pressing del or F10 right after the memory count and there you can disable onboard sound and video. It will be under one of the options (sorry... I don't remember what each option says) probably saying peripherials? I don't remember phoenix that well... just poke around and you will find it. Then when you are done save and exit and skip the plug n'play prompt to install microsoft's drivers. One you get into windows intall the manufacture's drivers for the sound and video. You might want to take these one at a time. In you bios disable both... but put the vid card in and not the sound, and install the vid card, then put in the sound card and do that one,