"Since HP now owns Compaq I would follow their lead and links for the needed MS download.
Information in this document applies to HP Compaq dc7600 and dx7200 systems. resolution
HP has written SoftPaqs that install the Universal Audio Architecture (UAA) high-definition audio class driver and resolves the issue. Please download the appropriate SoftPaq (depends on the operating system and service pack level) and read the instructions carefully before proceeding." http://h20000.www2.hp.com/bizsuppor....jsp?lang=en&cc=us&objectID=PSD_DA050728_CW01