lastlupin

so i just downloaded n played a game of tiberian sun with al and after i got finish my malwarebytes popped up and said there was malware and to disinfect and reboot and i clicked it and it didnt reboot so i tried opening chrome and it gave me and error that i cant, and i couldnt open any programs so i delete the game reboot and its fixed, why does it show up as a trojan in malwarebytes