I am pretty sure you did this but did you load the registry from the XP disk offline? You will not see a Current Control Set, only Current Control Set 001 or 002.
You don't need a boot disk as shown in the guide. Just load the hive from the Windows/config directory or the XP drive
You may find the printers in other locations according to the link I posted. This would be more accurate then looking under the Monitor key.
Edited by JohnC_21, 01 August 2016 - 02:35 PM.