http://support.dell.com/support/down...l=EN&catid=-1&
impid=-1&servicetag=&SystemID=PLX_PNT_P3C_GX150&hidos=WW1&hidlang=en&TabIndex=
Under audio I'd try the AD1885 drivers.
Look under device manager to see if you have any other missing drivers (start, run, devmgmt.msc).
You might also want to update a few components:
DirectX 9.0c from august 2008 (because your report said DirectX 7)
http://www.microsoft.com/downloads/d...displaylang=en
And a few miscellaneous ones in case you didn't have them yet:
Internet Explorer 6 SP1
http://www.microsoft.com/downloads/d...b-20b602228de6
Windows Media Player 9
http://www.microsoft.com/windows/win...Downloads.aspx
Windows Installer 3.1
http://www.microsoft.com/downloads/d...displaylang=en