A boot scan, also known as a shoe scan or pre-boot virus scanner, is an advanced tool used by antimalware software programs to detect and eliminate malware that might not be detected using traditional scanning tools. This type of scan may be scheduled to be run on a regular basis, or manually by the user when they suspect that their computer has been infected. A majority of antivirus programs let users choose the sensitivity level of the boot scan, and what actions should be taken in the event of a threat being detected.

A boot scan can be effective because it lets an antimalware software to identify files in use by the OS. These kinds of files can’t be deleted because they are always being used by the OS and will result in an Access Denied error when attempts are made to remove them. The boot scan will find these files and permit antivirus software to erase them before the OS can begin using them.

The duration of a boot scan will vary depending on a number of aspects, including the speed of the CPU, how many system files are being scanned and whether or not the computer is being used during the process of scanning (thus changing the status of these files). However, it is typical for this type of scan to take significantly longer than an ordinary antivirus scan because of the extensive nature of the process.

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