Open folder appears unresponsive solution

The computer has been in use for a few months. The first time I open a folder with video, the response speed of the computer will be very slow, and sometimes it will be unresponsive. What is going on?
Relentless The test finally found that this phenomenon usually leads to two reasons:
First, the system appears after installing some anti-virus software. The real-time monitoring function of some anti-virus software will automatically decompress these files for scanning when there are directories with large compressed packages or ISO files. For some hosts with poor configuration, it will cause slow speed. It is recommended to set your own anti-virus software to turn off this feature.
Second, no anti-virus software will be installed. XP has a feature that automatically extracts multimedia file information and previews it. XP will automatically scan and read the information of these files and display the first screen of its thumbnail or video. If you have a large number of video files with large or large compression ratio (especially DVDrip, RMVB) in a certain folder, this process will call the decompression program. For a host with a lower configuration, it is easy to make the system run very fast. Big reduction, serious will lead to crash
What should be done to solve this problem?
Windows 2000/XP video file preview file "shmedia.dll" rd plays a decisive role, cancel the system Video preview function: Click “Start →Run”, enter the “regsvr32 /u shmedia.dll” command in the Open “Run” dialog box, "OK" The dialog box, and then "OK". If you want to turn on the video preview function later, just enter the “regsvr32 shmedia.dll” command again in the “Run” dialog box.
Close Image Preview: Open “Registry Editor”, find and delete [HKEY_CLASSES_ROOT\\ SystemFileAssociations\\image\\