Why dont use usb sound card?
http://sg.creative.com/products/product.as...9&product=17751
i duno the price though

ASIO driver only allow audio signal to bypass the windows audio kernel mixer, only improved the audio quality(better resampling quality than windows according to wikipedia ) little bit.
i used it before, can barely tell the different at all.

For completely improve the audio quality (better signal to noise ratio) buy usb sound card loh