Every now and then my pc freezes and I have to shut it down. If I open Task Manager I can sometimes shut the application down but sometimes the Task Manager Window freezes as well. It has been happening fairly regularly recently while I am using Windows Movie Maker to make a slide show. It never happens in say word or just surfing the net so I don't think it is a virus. Is it likely to be a memory problem hence it freezes handling images? I've got 1gb total of Twinmoss memory installed - 2 x 512mb run as dual channel. It also happens when I view pictures using the Nikon supplied software Nikonview 6.