Unable to open PDF files in Internet Explorer. Problem When attempting to open a PDF file in Internet Explorer, the file may not be displayed, Internet Explorer may flash in and out of focus or an error message may appear. Cause The following are the main reasons why PDF files cannot be displayed properly within the PDF Converter Professional web viewer Security settings. Internet Explorer security settings may block the PDF Converter Professional web viewer from lauching successfully. Failed installation of the PDF Converter Professional web viewer. Incompatiblity with the design of a website. Some websites are specifically designed to use Acrobat for displaying PDF files. Pdf Flash Viewer For Website' title='Pdf Flash Viewer For Website' />These sites will not work with PDF Converter Professional. Solution 1 Ensure that the Internet Explorer security settings are not set to high. The High security setting can block the web viewer from loading. Follow these steps to adjust the security settings Use the Windows Start menu to open the Control Panel. Support PortableApps. PDFXChange Viewer Portable works best with the PortableApps. Platform. Help and OCR Add a full PDF help. Download free Acrobat Reader DC software, the only PDF viewer that lets you read, search, print, and interact with virtually any type of PDF file. Problem When attempting to open a PDF file in Internet Explorer, the file may not be displayed, Internet Explorer may flash in and out of focus or an error message. Select Classic View on the left panel if it isnt already enabled. Open the Internet Options control panel by double clicking. Select the Security tab and then click the icon labeled Internet. Adjust the security level to Medium high or lower. PDF, Comic Book, and Ebook Reader. Sumatra PDF is a lightweight PDF, DjVu, eBook, and comic reader packaged as a portable app, so you can open your files on the go. Interactive GIS Viewer. This is an interactive viewer to search, view, and print property maps and many other GIS data layers. XDoc-Java-Image-Conversion1.png' alt='Pdf Flash Viewer For Website' title='Pdf Flash Viewer For Website' />If there is no slider available, click the Default level button to enable the slider. Click OK to save the changes. Note When running Windows Vista or Windows 7, Protected Mode may also cause problems opening PDF files. Pierre Legrain'>Pierre Legrain. Disabling Protected Mode on the Security tab may resolve some issues. Solution 2 If the PDF Converter Professional web viewer is still failing after adjusting security settings, unregistering and re registering the viewer may resolve some issues. Follow these steps to re register the web viewer Close out of all applications, especially Internet Explorer. Click Start Run to open the run dialog. It is also possible to use the Windows Key R keyboard combination to open the Run dialog. Use the corresponding command below to unregister the web viewer. The path will need to be adjusted if PDF Converter Professional was not installed to the default location. C Program FilesNuancePDF Professional 5binIEPDFPlus. C Program FilesNuancePDF Professional 6binIEPDFPlus. C Program FilesNuancePDF Professional 7binIEPDFPlus. C Program FilesNuancePDF Professional 8binGPlus. Doc. Server. ocx A dialog will appear stating that the unregister server succeeded. If any other message appears, check that the file location is correct. Open the Run dialog again using step 2. Use the corresponding command below to re register the web viewer. The path will need to be adjusted if PDF Converter Professional was not installed to the default location. C Program FilesNuancePDF Professional 5binIEPDFPlus. C Program FilesNuancePDF Professional 6binIEPDFPlus. C Program FilesNuancePDF Professional 7binIEPDFPlus. C Program FilesNuancePDF Professional 8binGPlus. Doc. Server. ocx A dialog will appear stating that the register server succeeded. If any other message appears, check that the file location is correct. The web viewer should now function properly. Lens Flare Adobe Premiere. Solution 3 If after following solutions 1 and 2, PDF files still cannot be opened within Internet Explorer, it may be an incompatibility with the website design. In this case, we recommend unregistering the web viewer and leaving it disabled. When accessing a PDF file with the web viewer disabled, a message will appear prompting the user to open or save the file. Clicking Open will open the PDF file within the PDF Converter Professional application, rather than the web viewer. To unregister the web viewer, follow steps 1 4 of solution 2. Do not re register the web viewer by completing all of the steps.