If you want to selectively scan a drive or folder by Windows Defender Windows 8, refer to the tutorial below.
Microsoft introduces Windows Defender or Microsoft Security Essential in a new way, making it strongest ever.
As Microsoft tries to remove the need of any third party Antivirus software, so the strength of its own antivirus Windows Defender must have to be increased and Microsoft does it exactly. The new Windows Defender is so strong and secure that, really no 3rd party antivirus software is needed. But as other 3rd party anti viruses, in case of windows Defender, you will not get a san option in the context menu
of a folder or drive. If you want to scan selectively scan a folder or drive, follow the instructions carefully.
1. Press Windows + F to open the Search window. Type Defender and open Windows Defender from the search results in the Apps section.
2. Switch to the Home tab of Windows Defender. Select Custom Scan and click on Scan Now.
3. Now you will be asked to browse for the folder or drive you want to scan. Select that and click on OK.
Now you will see the scan in progress.