Hello, recently I got some problem with my win7. Yesterday I downloaded 2 MKV files and I can't click/right-click on them as it shows error message "Windows explorer has stopped working", then I've been given 2 options : Check for solution or Restart the program. And it lags so much when the message showed up. However, I still able to play those 2 files if I double-click on it fastly (before the error message showing up) and the video is okay too. Since my other mkv files I had (and other various file formats like AVI, MP4 etc..) are working just fine, I thought there's something wrong with the latest mkv files I've downloaded. Then I tried to convert it to become avi, but my converter won't read the file because it's in chinese. I'm unable to rename it too OTL Then it must be something wrong with my windows explorer. I saw similar problem like this in THIS THREAD, but the poster was trying to delete the file, while I dont want to delete my files because they're both worth almost 2GB in total Unless there's any valid reasons about the way I downloaded them (ie, pause-start the downloads can interrupt the file). I hope anyone can help me Thank you By the way, somehow I managed to open it in VirtualDub and I'm able to convert them to AVI (it took 3,5 hours to finish converting for 1,8 GB files! ) and I'm using cmd to delete the mkv files just like in the link above. Is it count as solved? But I'm still curious of what causing this file to corrupt my windows explorer, it will be nice if there's another way to fix it in case I get another similar problem some time in the future, without having to spend my time converting it @.@ Thank you.