@Raine
i think you are right, i just noticed something strange
i went into Add-Remove programs, and found
"High Definition Audio Driver Package - KB888111"
there was a link to
http://support.microsoft.com/kb/888111
and there it said,
This driver is designed to work with the following operating systems:
The original release version of Microsoft Windows Server 2003
Microsoft Windows XP with Service Pack 1 (SP1) or with Service Pack 2 (SP2)
Microsoft Windows 2000 with Service Pack 4 (SP4)
Note This driver does not work with Windows Server 2003 Service Pack 1 or a later service pack.
The strange thing is that there is no mention of Windows Xp Service Pack 3, so can service pack 3 be the cause of my problem? :S