I was responding to one of MyLot question all of a sudden my pc talks like radio

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So, here's my experienced yesterday. I was responding to one of the posted question and all of a sudden my pc talks like radio talks. I got spook by the loud noise. I dont even have anything playing nor any music is going. So I quickly quit the browser and all of the software that was open, still I heard this sounds that is doubled. So I quickly turn my pc off and run my virus software. After it turns out I got something name in between a 'trojan'. Lucky my virus software was able to delete and healed my pc. Wow, I thought what the heck is going on? Have you ever encounter this issue?