Never encountered this in XP but on Vista it can drive me crazy sometimes when I am trying to upload a bunch of pictures to something. I finally finished editing the pics from the Quinceanera I did a few weeks back- shot some 600, deleted the really bad ones, got down to 400 and touched up the best which still left me with about 150 for them. Now I am uploading them to get prints made to present to them (so maybe they will want to order more) and every so often the computer thinks I double clicked (I guess is what happens) and it decides to create a copy of every photo I have selected so far.
By the time I got through all 150 I had as many as six additional copies of the photos added to my HD! That is in addition to the originals plus a smaller size for posting on the web (I will add some to my gallery later but certainly not all 150!). Now I will have to go through, try to select them and delete those without it creating more. Just like in the days before po-up blockers when they popped up as fast as you closed the previous one. Drives me nuts every time it does this!
Just venting- probably not much I can actually do about it. The upload says it will take about an hour and a half for that many.