I am running vista 32, Explorer 8, Outlook 2003, Kaspersky Anti virus, I'm on a wired home network with modem,Toshiba Satellitecomputer. I've been saving and opening mht files everyday. Today I turned on my laptop and none of the mht files will open. A window pops up that asks "Do you want to save this file?" When I hit cancel the window closes. When I hit save, another window tells me "I already have a file by that name, do I want to replace it? " Whether I choose yes or no, doesn't matter, the file won't open. I use these files for work. I'm upset can any one help me? I'm not familiar with blogs and forums so please be patient if I don't understand some protocols.