Update
to the latest version of Adobe Reader, it is a known issue in Adobe
Reader 10.0.
If that didn't work, http://www.fixya.com/support/t255250...pted_pdf_files Open Adobe Reader --> Edit, then Preferences --> On the General Tab, uncheck Enable Protected Mode on startup --> On the Security (Enhanced) Tab, uncheck Enable Enhanced Security It is usually not recommended as Adobe introduced this feature to prevent infecting your PC with malware hidden in PDF's. Use it only if you trust the source of the PDF. So, remember to re-enable this option after. http://www.pdf.viewertool.com/
If that didn't work, http://www.fixya.com/support/t255250...pted_pdf_files Open Adobe Reader --> Edit, then Preferences --> On the General Tab, uncheck Enable Protected Mode on startup --> On the Security (Enhanced) Tab, uncheck Enable Enhanced Security It is usually not recommended as Adobe introduced this feature to prevent infecting your PC with malware hidden in PDF's. Use it only if you trust the source of the PDF. So, remember to re-enable this option after. http://www.pdf.viewertool.com/