Donseba you will have to go and snag afudos 211 load it onto a floppy along with the 2004 bios image stick it in the floppy drive go into bios and set your floppy as your first boot device and boot. it will go right on into a dos boot and just do what is needed to install. Now if you have done something wrong it will let you know that it can't read your bios or whatever. do not panic just pop out the floppy and restart it will boot with your current bios and then start again. when I went back I edited the number portion off of the bios.
Instead of putting P5WDH2004.rom on the floppy. Rename it to P5WDH.rom
this is how i went back from 22xx. Still if you are going back I think i would fall back to 1707, run it for awhile and see how you like it. if you don't then load up 2004. stay away from the 19xx bios' as for me they sucked too.
Good luck, you can read tutorials on using afudos, it is really easy but, for a first timer it can be nerve racking doing this stuff. If you totally screw the pooch there is asection on bios recovery in your P5WDH manual.
If you read up you can do this!!

WZ