I like to download videos from youtube that as we know most of it is in .flv format. the problem is about 3 months before i upgrade my window 7 from basic to ultimate. since then whenever i open folders containing all the .flv videos my window explorer abruptly stopped working.also, i cannot delete those videos even if i want to, when i try to it will just show "preparing to move to recycle bin..." and it will be in that condition for an hour or so, so i give up. it also applies when i tried to move the videos to different location, it won't budge. the best i can do is copy the videos and the original one can be deleted by luck, if lucky i can delete one but only one video. if i open the folder too long and then try to go to another place, my system will be messed up, the files cannot be read, the disk cannot be opened, until i am forced to restart the computer. the same also happen if i try to rename the .flv videos or the folder containing them.can anyone please tell me what is the problem and how can it be fixed? please!