Problems with PowerPoint and toshiba satellite?

I have been going to school online, and now I am in a speech class. I have to make a power point for each speech but I have been runnin into difficulties. I open PowerPoint from my schools website and it usually goes to a download screen and opens up. Now the download bar will come up, stop half way, and disappear. Nothing will open for some reason, and it's just like this on my lap top but no others. I don't have PowerPoint downloaded on my lap top but neither did my old one nor the desk top I used in the past. My Internet is working just fine. I also use google chrome so maybe it's a problem with the browser? I usually use firefox. Any help and or advise would help greatly, I cant use another computer at this time and need to get through this class.