Acer Aspire One Zg5 Audio driver not getting installed

Certian device driver installations might require existing system files to be modified which in return calls for the Windows Cab files which are normally in the i386 folder located on the Windows XP CD. If you have full access to this computer then all you have to do is find or borrow someone else's Windows XP Home CD and copy the i386 folder from the CD to somewhere on your local disk, root of C drive (C:\i386) would be fine. Then open the registry (Start > Run > regedit > OK) and modify the following value to point to the i386 folder.
Expand each of the following key: HKEY_LOCAL_MACHINE - SOFTWARE - MICROSOFT - WINDOWSNT - CURRENTVERSION, after you click on CurrentVersion on the right hand list, look for the value called "SourcePath". Double-click on 'SourcePath' and change its data to read C:\i386 (assuming that is where you copied that entire folder). Close registry editor, reboot and try installing the drivers again.