I would like to say it is nice to meet you!
sometimes, the speaker cable may have either came out or someone put it in the wrong input.
The volume control in XP not the speaker nob but he can check that too.
another thing, do you know for sure if this is a new hardware upgrade or not?... he is not really making it clear to me or mention any of it. He may have put a new hardware "video card" in the system and that driver may or may not have work right.... so, upgrade the driver. however, he also may have a intergrated video card and it might need to be disable in the bios in order to make the AVG, PCIe, video card to work if he didn't dissable the intergrated video card and was installing a AVG,PCIe.... this could cause a conflict as well in this case could cause the sound not to work. This is why I'm asking these question. there are many reason why a sound card doesn't work.
do you see my point now? now this driver upgrade may work without all this info if his lucky.
however, I just wanted to point things out incase it may not be a upgrade driver fix since he never mention his specs. forgot to mention in my lasy post if he was installing a new video card and did he try safemode to install this driver?
it's a learning lesson for all of us and I'm still learning everyday this is why all of us are here.
Might Mouse