|You can't run a preinstalled version of xp on your computer. |
Not only is it illegal but it was installed in a different system so it has different drivers, dll's, registry entries, etc. not to mention seen differently by the drive hardware which usually results in it not booting [different drive geometry]
The message "ultra66 (bios) not installed " is normal if there is no ultra66 drive connected to the ultra 66 interface. This is a hardware message not a windows message.