First you have to Remove all previous versions of Acrobat, and then reinstall.

  1. Go to Start > Control Panel (Windows XP) or Start > Settings > Control Panel (Windows 2000).
  2. Double-click Add Or Remove Programs.
  3. Select Adobe Acrobat [version] and click Remove.
  4. When prompted, confirm that you want to remove Acrobat.
  5. Repeat the above procedure for all installed versions of Acrobat.
  6. Restart the computer, and then reinstall Acrobat.

now try to Repair the HKCR\AcroExch.Document registry key.

  1. Go to Start > Run, type regedit in the Open text field of the Run dialog box, and then click OK.
  2. Back up your current Registry file:

    1. In the Registry Editor dialog box, choose File > Export.
    2. Type a name for the file and choose the location.
    3. For Export Range, choose All.
    4. Click Save.
  3. Navigate to HKEY_CLASSES_ROOT\AcroExch.Document.
  4. Right-click AcroExch.Document and select Delete; make sure you have the correct key, and click Yes on any prompts.
  5. Right-click AcroExch.Document.7 and select Delete; make sure you have the correct key, and click Yes on any prompts.
  6. Repair your Acrobat or Reader installation using solution 8 below.

now Make sure that AdobePDF.dll is enabled. Select Tools > Internet Options > Programs (tab) > Manage Add-ons.

  1. Set Show to "Add-ons that have been used by Internet Explorer."
  2. Find and select Adobe PDF Reader.
  3. Make sure Enabled is selected.

now  Delete temporary Internet files.

If you use Internet Explorer, delete the temporary files that Internet Explorer creates:

  1. In Internet Explorer, select Tools > Internet Options.
  2. Click Delete Files in the General tab, and then click OK when prompted.

 now Try to open a local copy of a PDF file in the web browser.

  1. In the web browser, choose File > Open (or Open File).
  2. Choose All Files from the Files Of Type pop-up menu (Windows)
  3. Click Browse
  4. Select the PDF file you saved in step 1 of task 5, and then click Open to open the PDF file. If Acrobat or Adobe Reader displays the file, but won’t display it on the web, the web server has a problem serving the PDF file. Contact the webmaster of the site from which you downloaded the PDF file.

how to Repair Acrobat or Reader.

To repair Acrobat or Adobe Reader, you must have access to the installation media or to the network path from which you originally installed the product.

  1. Choose Start > Run, type appwiz.cpl in the Open text box, and then click OK to open the Add Or Remove Programs dialog box.
  2. Select Acrobat or Adobe Reader, and then click Change/Repair (Windows XP) or Change/Remove (Windows 2000).
  3. In the Setup dialog box, click Next.
  4. Select Repair, and then Click Next.
  5. Click Update.
  6. When the process is complete, click Finish.