While you have valid rescue media, it is possible that further down the line you add hardware to your computer without updating the rescue media. Macrium Reflect provides a way of loading drivers for these pieces of hardware when in Windows PE.
Select the Restore > View Restore > View Unsupported Devices menu option, the following dialog will be shown:
a list of devices which are currently unsupported will be shown. Drivers can be loaded using two methods:
Select a device from the list and click the Locate Load Driver. Browse and select a driver INF file in the dialog that is displayed. Macrium Reflect will try and load the driver and report the result back.
Select a base folder using the ellipsis button and then click Scan. Macrium Reflect will traverse the folder structure looking 'Scan Folder'. The selected folder structure will be searched for driver INF files for all devices in the list. After the scan, a dialog will be displayed showing which devices had drivers loaded.