When you try to print a PDF file in Internet Explorer 7 on Windows Vista, the file does not print and you receive the error message "Could not start print job."
The Display PDF In Browser option is selected in Adobe Acrobat 8 or 9 or in Adobe Reader 8 or 9. (To see this option in Acrobat or Adobe Reader, choose Edit > Preferences > Internet.)
Protected Mode is enabled in the Internet Explorer Security settings.
Protected Mode redirects files to a secure Virtualized folder, which replicates the folder structure on your computer but keeps the files isolated from the rest of your computer to protectyou from malicious software.
Warning: Protected Mode can protect your computer from malicious software. You should enable Protected Mode again after you have printed the PDF.