How do you close the debugger in windows 2000 professional?

i have been trying to send some videos that i made to some of my freinds but everytime i try to send one this debugger comes up and says please wait! attatchment being debugged.i can send all the pics i want but when it comes to the videos it just stops and the debugger pops up.i have to shut my computer down to get it off my screen,help!!!!!