By using a bootable antivirus disk or USB stick
How to Remove Viruses Before Your Operating System Starts | Scan and Remove Malware
Most viruses are fairly easy to remove. Just open an antivirus scanner, wait for it to collect results, and then remove everything it finds. Sometimes, however, the virus just won’t go away and no regular antivirus solution seems to help.
So, what do you do about annoying, hard-to-remove viruses? Within the realm of antivirus software, there’s a whole category of tools that perform scanning before the operating system even starts. Often called bootable antivirus programs, they scan files and remove viruses before they even get a chance to open.
Below are the best ways to remove viruses before the operating system starts. If you are unfamiliar with this process, we will go through all the steps, including how to download the scanner and what to do next to make it run at startup instead of your operating system.
