Most peoples computers get exploited in only a handful of ways. Among the most popular methods is tricking people into downloading and running Trojans. Real antivirus programs will not pop up when you visit a website — then begin scanning your computer and claiming youre infected with dozens of viruses. Dont install software from websites unless you’re 100 percent sure the software is needed and is a legitimate product. If you install a program and your computer runs much slower, you should suspect malware at work.”]
Source: https://www.csoonline.com/article/3094285/spotted-9-signs-of-a-malicious-download.html