Hehe, having much the same at my work at the moment! We have a school laptop scheme coming into place and the kids have a choice between buying a scheme laptop (comes with a 3 year warranty and we will fully support it) or if they can use their existing laptop (as long as it was bought before the end of 2006 and they put their names down before the end of 2006).
It is the non-scheme ones that give us such a headache, proven by the following scenario:
Boy walks in with laptop, I go to do the necessary to it, i.e install sophos anti-virus, connect it to the domain and then do windows updates before putting the posturing and dot1x stuff on it.
Whilst doing the update the windows validation tells me that the copy is a blocked VLK license. Therefore I call him in and tell him that I can't do anything until a legitimate copy of XP pro is on the machine.
Pupil walks away looking rather rejected and then comes back two days later saying he has sorted the problem but behold upon doing the validation check it still says it is a VLK license that has been blocked! So I call him back in and show him the screen and have the following conversation:
Me:Your copy of XP can't be validated, I need you to put a legitimate copy on it and put the license sticker on the bottom
Pupil: But it is legal sir! I can prove it I took a screenshot saying it was validated yesterday
(Proceeds to show me some random screenshot and then trys to validate it the "way he did it" and still it says it is not genuine)
Pupil: I don't understand! I am using the license off of the bottom of father's PC and that one is legitimate and works!
I explain to him the finer points of licensing and send him on his way.
Grrrrrrrr, just a one of a number of stupid things I come across every day.