[SOLVED] Speakers no longer working/Found New Hardware

I have a Dell Vostro 200 desktop running Windows XP.

When I boot up my computer I get a bubble stating "Found New Hardware PCI device". It then goes on to open a "Welcome to the Found New Hardware Wizard".

I have not installed any new hardware however my Speakers no longer work.

I followed the Wizards instructions, including inserting the "Dell Drivers and Utilities" disc that came with the computer, however the wizard failed to identify the problem.

I have tested the Speakers on another computer and they work fine.

I have also updated all the drivers from the Dell site as well as all Windows updates from Microsoft.

Does anyone have any possible solutions?

Thanks in advance.