Mod Edit: Split from http://www.bleepingcomputer.com/forums/t/519780/explorerexe-using-too-much-cpu-please-help/ - Hamluis.
I noticed yesterday that explorer.exe is taking up too much CPU, which has never happened before.
After searching on the internet it said that it must have been a corrupt video on the desktop so I tried opening a video with vlc and it took too long and my computer froze for a long time(which had never happened before). I deleted all the videos by using cmd since I was unable to delete them normally.
So I believe I have the same problem here! Can this be resolved without a reformat?? No one likes a reformat!
Suddenly, explorer.exe is crippling my system. And it could have something to do with recently downloaded video files (.mp4) from my cell phone (Samsung s4). Or not. I'm not sure.
I know that when I open a windows explorer window, everything seems fine... until.... the moment I navigate to a folder containing these .mp4 files. I have made copies into other folders and the same thing will happen if I navigate to those folders.
I can navigate to any folder on my system with no trouble, and I can watch the CPU usage in Task Manager as I navigate. At that point, explorer.exe is only using about 4%. Normal. But as soon as I open any of the folders containing these mp4s, the usage skyrockets to 80-95%. Even after I close all windows, the usage remains 75-85%. At that point nothing on my system runs properly and I am forced to restart.
I have tried to run these .mp4 files before I restart. Windows media player crashes. It starts to play them but it only gets about half way and the video goes black with a white square. The sound continues, but the video is gone. Then all function of media player is lost and it I need to end the task. It seems to happen if I try to play any of these files. Keep in mind that before I hit play, I had already opened the folder that they are stored in. Hence sending the CPU to 80% before I can hit play on any of the files. One strange thing is that playing other video files in the folder will work fine, even with the usage up, but trying to open the affected ones will freeze it every time.
One thing that I also have in common with tora22 is that I can't delete these files easily. When I try to delete any of them, they don't delete. Either nothing happens, or I get an error loop of something like "Discovering Item: 0%"
Another thing I noticed is none of the "affected" files have a photo icon. They just have the generic symbol. All other .mp4 files I have do have a photo icon with a still shot from the video. These do not. And I am not talking about the folder view setting. I can see photo icons for other files in the same folder, but not for the affected files. I thought It was strange. My only other thought is that maybe it has something to do with an ID3 Tag editor I installed at about the same time as I downloaded the .mp4 files.
Any help would be much appreciated.
Edited by hamluis, 07 October 2014 - 08:43 AM.
PM sent new OP - Hamluis.