why computer hangs when opening a file/folder?

Clarifications

What type of computer is this?

What Operating System is in use Windows XP or something else?

What type of file are you attempting to open?

When you say [i]when i am clicking a particular file i can see color bar in address bar move very slowly and computer stop reacting and get turned off.[/i]

Is this in a Web Browser or just some form of Window?

Also how long does your computer run if you don't try to open these file types?

Col

it has to be something in the windows , if the media files are important , you have to reinstall the windows