Sigmatel audio updates.?

i have a sigmatel audio sound card in my xps 400 and i realy need to update the driver. i have been at this all day. the driver name is sthda.sys and the version is 5.10.4823.0000 (english). this is my last resort and i do not where ima go after this, please help me out with this and i will be your personal slave forever=).