I have a Lenovo Thinkcentre M55 8813-a21 (LKRYA75). The sound works just fine in any Ubuntu installation i do, but I cannot get sound in either XP or Windows 7. I also couldn't get the networking drivers to work in XP so I am now on Windows 7. I have tried the driver download page on the Lenovo website, but none of them work. I don't know where to go from here. Thanks in advance.