Sysprep failing to Reseal

I’m using a minimal Sysprep.inf to Reseal (mini setup, detect non pnp devices) an ESX virtual machine of Windows XP:

my sysprep.inf file reads as follows

[Sysprep]
BuildMassStorageSection=Yes
[SysprepMassStorage]

The rest of the inf is appended by our imaging agent; regardless reseals fails with the following error:

“An error occurred while trying to update your registry. Unable to continue.”

The mass storage section of the inf file has been ennumerated with the device ids and driver locations but I am amiss as to why this is failing?