Search for Windows Security
Click - Virus & Threat Protection

Virus & Threat Protection Settings
Click - Manage Settings

Exclusions (Bottom of page)
Click - Add or remove exclusions

Click - + Add an exclusion
Select - Folder
Add both these folders below
C:\users\your-name\appdata\roaming\Passenger2
C:\Users\your-name\AppData\LocalLow\Passenger2
C:\Program Files\Passenger2 (May be in Program Files (x86))