When something has caused your PowerPoint to close unexpectedly, there’s a good chance that you didn't get to save your work before it crashed. Luckily, PowerPoint has an autosave feature that saves your progress in a temp file every 10 minutes. By default, the temp file is stored in C:\\Documents and Settings\\\\Local Settings\\Temp. The filename will be pptxxx.tmp, where the ‘xxx’ is replaced with random numbers. Open the file with PowerPoint and then save the document.