using my lap top for music

[nomismo]

Hi i am new to this game,i have a super pro usb dac, this i am trying to use with my vaio lap top into an old meridian pre amp.

can i by pass the vaio's sound card and send the digits direct to the dac, if so what do i need to do,what software will i need and how to set it up. i am running windows 7 on the viao.

if you can help thanks.