[mikedomi]

it all comes too light now the answers is kids
if they can get on the internet that is most likely the problem
they have been some were and ill bet you I would start looking for a virus
or a back door program that have downloaded and they did not even know it

if this is the case the best thing you can do is to reformat
I have one bit of advice for you if you are going to but hoster on this keep the kids off the internet and if you can afford it buy the kids one of those $399/$499 dells it the long run you will save your self a lot of time and money

you don't know how many units I have had to reformat because of some ones jr on the internet

I hate to say it but children have made techs a lot of money because of were they go on the internet

anyway good luck on what ever you do