When you see this error message during you use PDF to test OCR products
Please turn off DEP for "pdf2txtocr.dll" application to try again, please refer to following steps about how to turn off DEP in your system,
1. Click "Start".
2. Select "Control Panel".
3. Select "System".
4. Click the "Advanced" tab.
5. In the "Performance" region select "Settings".
6. Click the "Data Execute" tab in the dialog box that opens.
7. Select "Turn on DEP for all programs and services except for those I select".
8. Click "Add".
9. The open dialog box will open. Browse and select "pdf2txtocr.dll" application in your computer.
10. Click "Open" then go to "Apply".
12. Click "Ok" then reboot.
By this way, you can solve this matter.