download driver
run file and extract to a directory of your choice
(you should be able to run setup and have it installed. if it doesn't, try the next steps.)
go back into the device manager and go back to the multimedia driver
right click -> properties
goto driver tab
go to UPDATE DRIVER
select NO, not this time, click next
select advanced option, the 2nd one, click next
put a check next to Include this location in the search, then browse to directory where you extracted files. The OK button will not be available unless the correct driver is found.
then go through the rest of the prompts and you should be fine. Might have to restart
good luck. If this doesn't work, get a friend to help you cause I'm not sure what you did with all this swapping and stuff. Usually, if you swap mobos, hdds, etc you'd have to do a fresh install of XP. Regardless, you'll have to install the audio drivers again if you reinstall.