There are many causes that you have threats in computer, like inserting external USB drives pen drives, external hard disk, connecting mobile to PC using Bluetooth, connecting to unprotected wireless networks.
Make sure the you have a security software is installed in your PC and maintain a good Firewall also it helps to block the threats. Millions of websites are there in world wide web, some ad ware sites if you click on download button or any ad some sort of plugins, toolbars and software's automatically downloaded form that ad ware website's these leads to changing the browser homepage and malfunction of Internet browser...etc.
If you copy files or software's mainly exe files from other infected PC, when the same copied to your PC, what happens here just you will open that drive by double click where in case double click in windows performs appropriate action or executes the programmes. As you copied the files from infected system when you double click on the drive it system executes virus and you PC will be infected. If you have any security software or USB security software's it blocks those threats.
Some sort of attachments in emails, mainly in Fake mails or some advertisements mails. They send the virus or infected in zip format we will download them and extract them this is one of the cause for Infection. As the technology improved alot these mails or attachments cannot be viewed, the Email service provider nowadays has maintaing good security with limited features. If you buy the subscription or using premium services you can avail good advantage of these security things
Better install a good Internet Security or All in One Security software's to avoid infections or threats.
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