Okay, I uninstalled the audio driver, but there is another program, "High Definition Audio Driver Package - KB835221", when I try to uninstall this, is gives me this message: "This program removes Windows XP KB835221WXP and restores your previous configuration". Should I uninstall this as well?
I will leave it alone for now and try to install the driver you suggested.
*Okay, I installed the driver you suggested, it went through the installation, but it's like it makes no difference, I click finish at the end and it's like nothing happened - still no sound. During installation, a box comes up saying "found new hardware" and then I gives me two options, I forget what they are (something like "search for file automatically", and "get files from CD" - I don't really know, I just select the first one), it searches for some files, finds it, and then continues and finishes.