It is always goood to have a power point presentation open directly as a slide show whenever you submit projects or when business meetings are held.To do this open the .ppt file in the corresponding software like ms office or open office and save it as a power point show file with an extension .pps. In Ms power point go to file> save as . Then select power point show(.PPS) rather than power point presentation (.ppt).
Note :
In Ms office 2007 and higher versions you can also save it as .ppsx or .pptx . However this file will not work in earlier version like office 2003.
In windows you can search for keyboard from start menu and open keyboard settings. Or you can go to Settings > Accessibility > Keyboard. In the keyboard settings window, toggle the switch that says "Use the Print screen button to open screen snipping". Hereafter whenever you press print screen button, you will be able to make a selection on the screen for a screenshot.