Do you have any programs installed that adds stuff to the right click menu..Sounds like one of them is corrupted..picaview for example adds a new menu for previewing images..If the dll that picaview uses for that gets corrupted windows would crash if you right click on an image..Think of any programs you have installed around the time this started happening and uninstall them..See if that fixes the problem..You can always reinstall the programs if thats not the reason..