You can tell if it has a bug by scanning the program with a antivirus software. If you have Norton that will do it automatically. But one of the easiest and most obvious reasons is if it doesn't work. But sometimes it will still work if it has a bug.
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When your computer has a computer bug you will start to notice a difference in the processing speed. Programs like Word or Excel might not open, or you will have a hard time bringing up the internet. If the computer virus is of the destructive kind, you might not be able to boot up your computer.