You can exclude files and folders from a scan to help scans complete faster. However, this might increase the risk of a malware ...

You can exclude files and folders from a scan to help scans complete faster. However, this might increase the risk of a malware incident. When you exclude a folder from a scan, you can also exclude the subfolders and files that the specified folder contains.

Example: %windir%\explorer.exe, %windir%\system32