The scene at the opening ceremony made Gates so angry.

What is it? It's the Blue Screen of Death! One of the servers in the lighting and projection system, which consisted of hundreds of Windows XP Embedded servers, crashed with the BSOD at the critical moment when the main torch was lit during the opening ceremony. If the previous photos were not enough to illustrate the awkwardness of this BSOD, the photo below should give you a clearer idea.