Troubleshooting problems opening PDF files in Internet Explorer window

Troubleshooting problems opening PDF files in Internet Explorer window
( Applies to Acrobat Reader version 6.0 )
When you click a .PDF link in a web page, the PDF document may not open and you see a image placeholder icon or a Red X in the browser window. To resolve the problem, follow the checklist mentioned in this article.
Checklist
• If your system has two versions of Adobe Acrobat Reader, uninstall both the versions and then install the latest version and the latest update. If you have earlier builds, update to 6.0.1 or above. Click Help menu and choose Update. BTW, updating to 6.0.1 also fixes another problem explained here
• Open Adobe Acrobat Reader and click Edit, Preferences. Choose Internet in the Preferences window. Uncheck Display PDF in browser option and close the dialog. Repeat the same and this time, enable the Display PDF in browser option.
• Adobe Acrobat Reader v6.x has Detect and Repair feature under the Help menu. See if repairing Adobe Reader helps you resolve the problem.
Steps specific to Windows XP Service Pack 2
• Open Internet Explorer, Tools menu, Manage Add-ons
• In the Manage Add-ons dialog, select Add-ons that have been used by Internet Explorer
• Make sure Adobe Acrobat Control for ActiveX (pdf.ocx) is Enabled. If it's disabled, enable the add-on and restart Internet Explorer.