Consider the following scenario:
You are using Windows Fax and Scan on a Windows 7-based computer.
You begin a new scan and then select Feeder(Scan both sides) for duplex-mode scanning.
You select Preview to preview the scan.
In this scenario, the preview scanning may fail, and you receive the following error message:
An error occurred while setting scanner properties. If another program is scanning, please wait for it to complete and try again.
This is a known issue with Windows Fax and Scan on Windows 7-based computers.
You may be unable to preview when you are scanning both sides by using a duplex-capable ADF Web Services scanner. To preview a scan, manually select single-side (simplex) scanning.