we need more info - OS, mobo, cards, etc.
are you installing the latest version of the driver? is your BIOS up to date? did you disable on board audio? etc etc
i installed a new video card on my computer and then it crashed but i restored my computer and everything ran fine but then it crashed again.... but nothing happended except my sound card was not regrestering so i reinstalled the driver again and nothing happened i restarted my computer and it just didnt work and i have installed the driver like a hundred times and my sound card doesnt show up...but everytime i install the driver it says its registered and then i restart adn its gone..... and everytime i start my computer an error comes up saying run32.dll caused an error and kernal will close or something do these affect it? im realy lost help me!!!