I decided to try HP instead of Dell (I have both OEM disc) and everything worked correctly the first time. Why is Dell different?
The tool you've used has got a bug at Dell!! It inserts the Dell System string instead of the Dell Computer string. Newer versions of AMI_SLIC3 are available......
Just edit the XP_SLP.INI from Dell System ; ´÷¶û OEM WINDOWS2003 SLP to the same as below. Dell Computer ; ´÷¶û OEM WINDOWS2003 SLP