Windows Explorer hangs when is displaying the list of multimedia files of a directory.
This is a problem related with the libraries that Windows uses to display the properties of the multimedia files.
Do the following:
1. Windows Key + R, type cmd and press enter.
2. type REGSVR32 /U SHMEDIA.DLL and press enter.
Now just try to display the files. Your computer is not going to have any problem to display video contents but if you prefer to enable it again type REGSVR32 SHMEDIA.DLL and press enter on a command window.