Unity crashes on startup

Help, I recently updated my computer to windows 10 and now whenever I try to get into unity it crashes and loads the unity bug reporter. I have tried to send a bug report using the bug reporter, but when I tried to send in the report, the bug reporter crashed as well. I have already tried downgrading my computer to windows 8 but it still does not work! I am hoping somebody can help me with this. Thanks in advance! :)