I wonder if this one is the classic.
Most onboard HD audio drivers require we install the MS UAA first. let's find that and the CRT.
1. MS UAA link.
2. I am left to wonder why you would not use the emachine's supplied OS but here's the CRT.
http://support.microsoft.com/kb/948619 describes how to put them into the WinSxS folder.
http://www.microsoft.com/download/en/details.aspx?id=5582 is the VC90 installable.