Run Slic dump toolkit. You should now have ASUS SLP and DELL SLP also. So you can now use either to activate Win XP.
SLIC Toolkit v3.2 actually shows "No OEM SLP String Found!". I am getting pretty confused with this BIOS.
You might need to post it in the XP SLP Thread and ask 911Medic to look at it. It may need to have the SLP String added in a certain way or to a certain location.