Dont format, dont partition, dont do anything of the sort. The problem is a corrupted video file, or files. I just fixed this very same problem on a friends comp last week. First thing you need to do is figure out which one it is. Most likely, it is the newest file you put in there..
Try moving them to another directory, or deleting them one by one (make sure recycle bin is large enough so you can undo) and explorer should tell you 'cant move/delete xxx because it is in use by another application'.
After you figure out which file(s) cause the problem, reboot, go directly to command prompt, and delete the file(s). Dont open that directory first or you will be unable to delete it.
Your problem will be gone.
Edit: BTW, explorer.exe is not IE.
Try moving them to another directory, or deleting them one by one (make sure recycle bin is large enough so you can undo) and explorer should tell you 'cant move/delete xxx because it is in use by another application'.
After you figure out which file(s) cause the problem, reboot, go directly to command prompt, and delete the file(s). Dont open that directory first or you will be unable to delete it.
Your problem will be gone.
Edit: BTW, explorer.exe is not IE.