OT question, but there's a lot of knowledge on here

I recently bought a touchscreen till for the shop - ridiculously cheap (a fiver!)
It's currently installed with a castrated version of win NT which won't connect to a network.
There are USB ports that won't work under NT
There is no floppy drive.
There is no optical drive.
(and no way to fit either)
It will net-boot, but not boot from USB
I want to install XP pro (the till came with a licence

)
so: only method I can think of:
Put HD in another PC, install XP, then swap drives back.
obviously, that didn't work.

So I now have a harddrive that will boot to NT (and has access to the XP partition), but won't boot to XP -
and still has no network, USB, or removable drives.
All the xp installation files are on the HD
After googling, it would appear that re-fitting the HD in a standard PC, uninstalling all drivers and re-fitting in till will allow XP to install the correct drivers.
BUT: is there a way to uninstall the drivers from the XP installation via the NT installation, to save me disconnecting/reconnecting HD (which is a pig of a job)
last resort would be to set up a net install of XP - is this a big deal?
TIA