As far as I know the HD is poped out from the front of the machine, two sliding rails hold it in place, you may need to remove the front plastic front to get the HD out.
Think you are right LL, you have to remove the front cover of the unit to access the HD.
DS, I can get that sorted for you if you dont make progress yourself, I will be in Mohill on Friday night, so I will drop off another unit for you if you want, and pick up the old unit and wipe the HD and install XP. That unit you have is about ten year old, or more.
Let me know
John