Hello. As you know XP is not supported by Dell on your model, meaning that it does not supply the necessary drivers for XP.  The problem is that although the audio driver you found is for XP, in order to install an audio driver in a Dell laptop with XP you have to first install the System Software & restart, then the Intel Chipset software and restart. This allows the operating system to become aware of the audio manufacturer's hardware on the motherboard and allows the appropriate driver to be installed.

Dell does not supply the System Software for your model, however there are 2 Intel software items you could install and then re-try the audio driver.

Intel HM67 Express Chipset Family

Intel Management Engine Interface

i have the same problem when loading the driver.. I have tried your instruction but it does not work for me...

Any other suggestions that might work?

Thanks!

Sorry but I don't have any additional suggestions at this time. I have an old laptop that needs replacing but face the same problem of how to support XP on a new machine, so I am keeping my old one as long as possible.