You need some 'explanation' in case it does - like this stuff happens and there are these ways to prevent it - and everything you have done - use it to your advantage
I was doing a presentation of a database front end system on a clients system on their dial up connection and these pop up messages kept showing "Hi im Mandy looking for fun in your area..." or something like that.
It brought a chuckle from the audience, but was a bit annoying after the third or so time!
Hope your presentation goes well tomorrow