My game barely starts (W/ Incident Identifier)

My game takes hours to load and when it does it's usually windowed and won't allow me to click on anything, and whenever I do play the game it is suddenly very laggy (which it usually isn't). Whenever I force quit I get the Incident Identifier: 483F6B76-24C6-4E4D-83D2-AF5020373CB5. If anyone could tell me what this means I will be forever grateful.