All my friends use pdf documents

The PDF Shell component in Acrobat DC and Acrobat Reader DC allows you to see the thumbnails of PDF documents in Windows explorer, on both 64-bit and 32-bit versions of Windows. By default, this feature is OFF. You can enable it using a specific setting available in the preferences. Note:
For Acrobat XI and Reader XI, the thumbnails of PDFs are automatically shown in Windows Explorer on Windows 32-bit systems. However, the same is not supported on Windows 64-bit systems.
Steps

Open Acrobat DC or Acrobat Reader DC. On the Edit menu, choose Preferences.

In the Preferences dialog box, choose General in the Categories list, and then select the Enable PDF thumbnail previews in Windows Explorer check box.
Note:
If you don't see the Enable PDF thumbnail previews in Windows Explorer checkbox, update your Acrobat DC or Acrobat Reader DC to the latest version. To automatically update from the product, choose Help > Check for updates and then follow the steps in the Updater window to download and install the latest updates.

Click OK.

Wait for a few seconds while Acrobat DC is configured to show thumbnail previews in Windows Explorer. Note:
In Acrobat Reader DC, you see a prompt asking for the feature to be added to the current installation. Click Yes to confirm.
https://helpx.adobe.com/in/acrobat/using/enable-pdf-thumbnail-preview-windows-explorer.html

Convert PDF to JPG Online

Try reloading the PDF software.

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PDF Repair Toolbox

in order to open PDF documents, you need to have adobe acrobat reader installed. you can download and install it through adobe.com

Help with PDF Documents Some documents on Maine.gov are provided in PDF format. In order to view or print PDF documents, you need the free Adobe Reader. Generally, you will find an alternative format is also provided for the document, such as Microsoft Word, HTML, or plain text. If you cannot access a document in PDF format and there is no alternative version, please contact the agency or contact the Maine.gov webmaster for assistance.
Adobe PDF-to-HTML Online Conversion Tool
We've provided solutions for some common PDF issues below.
General Tips:

• If you are having trouble opening a PDF document, one of the first things to try is updating your Adobe Reader to the latest version. You may also need to update your browser if you are using an older browser.
• Additional support is available on the Adobe Reader Support Page (Adobe.com).
• You may also want to read Adobe's more detailed troubleshooting tips.

Problem 1: Blank Page in Browser You have selected to download a file and you receive a blank page with a "Done" message at the bottom of the browser. This may be because you do not have enough space in your temporary internet file folder to complete the download.
Solution: Internet Explorer: Tools> Internet Options> Temporary Internet Files> select Delete Files
Netscape: Edit> Preferences> Under Category on the left Advanced> Cache> click Clear Memory Cache
Problem 2: Blank Page "%PDF" You received an error message containing "% PDF" or you have received a blank page while trying to download. This is due to a problem with your web browser not opening .pdf documents correctly.
Solution: Adobe Acrobat Reader 5.0: Edit> Preferences> General> Options> Web Browser Options> make sure the Display PDF in Browser box is not checked.
Adobe Acrobat Reader 6.0 and newer: Edit > Preferences > Internet > make sure the Display PDF in Browser box is not checked.
Problem 3: "Error Locating Object Handler" You receive an error message that says "Error Locating Object Handler" while trying to download a document. This is because there is a dependency with a plug-in for Adobe Acrobat while using Internet Explorer.
Solution: Please go to the following website for detailed instructions: http://support.microsoft.com/default.aspx?scid=kb;EN-US;q262213
Problem 4: Unable to Print You have successfully downloaded the pdf, can view it on your computer screen but are unable to print. This is due to a post script error with your printer.
Solution: In any Acrobat Reader program: File > Print > check the Print As Image box > OK
Problem 5: "Adobe Reader could not open file" You received the error message "Adobe Reader could not open 'filename.pdf'" because it is either not a supported file type or because the file has been corrupted (for example, it was sent as an email attachment and wasn't correctly decoded).
Solution: Adobe Acrobat Reader 6.0: Edit> Preferences> Internet> make sure the Display PDF in Browser box is not checked.

Adobe Acrobat is a family of computer programs developed by Adobe Systems, designed to view, create, manipulate and manage files in Adobe's

Plug-in from Adobe. It reads documents in PDF format on any platform.


A program from Adobe that lets you capture a document and then view it in its original format and appearance


Adobe has changed the names of the products in the Acrobat family regularly, also splitting-up, joining, or discontinuing products. Between version 3 and 5, Standard and Professional versions were one product simply called Adobe Acrobat.
As of October 2009[update], the current main members of the Adobe Acrobat family are:
Adobe Reader 8/9 Icon

• Adobe Reader 9 (Windows, Mac and Unix)
• Adobe Acrobat 9 (Windows & Mac only; no Unix version)
  • Adobe Acrobat 9 Standard
  • Adobe Acrobat 9 Pro
  • Adobe Acrobat 9 Pro Extended (includes Adobe Presenter)

The latest version
Version 9.0 Adobe Acrobat 9.0 was released July 2008:[10][11]

• PDF version 1.7 (and prior) supported. There are Adobe extensions to PDF 1.7 for Acrobat 9.
• Product Family includes: Acrobat Standard 9 (Windows only), Acrobat Pro 9, Acrobat Pro Extended 9 (Windows only).
• Pro Extended Version includes Adobe Presenter and the features of Acrobat 3D.
• The ability to create Acroforms was restored to Acrobat Standard in this release (in versions 6 through 8, Acrobat Professional was required).
• Enable real-time collaboration of PDFs with synchronized document views and chat.
• Improved Web Capture for capturing entire web pages or just some parts into PDF.
• Integration with acrobat.com to enable storage and sharing of PDF files.
• Personalize a PDF Portfolio with customizable templates for navigation and branding.
• Compare and highlight the differences between two versions of a PDF document.
• Insert FLV (Flash) or H.264 video for direct playback in Adobe Acrobat and Adobe Reader.
• Convert a variety of video formats to FLV for playback in PDF.
• Create PDF maps by importing geospatial files that retain metadata and coordinates.
• OCR PDFs (Paper Capture) using ClearScan. Adobe ClearScan technology creates custom Type1-CID fonts to match the visual appearance of a scanned document after optical character recognition (OCR). ClearScan does not replace the fonts with your system fonts or substitute them by Type1-MM (as in Acrobat 8 and earlier versions), but uses these newly created custom fonts. The custom fonts are embedded in the PDF file (this is obviously mandatory). If the OCR does not recognize a word with enough confidence, then the image (bitmap) of the word is shown in the PDF and the text is put above but hidden (same as what is made in "Searchable Image" mode).
• Adobe Reader 9 drops support for Adobe Reader Extensions 5 and 6 which permit Adobe Reader client software to save changes to filled-in forms in PDFs. Adobe Reader Extensions 6.1 and newer are still supported. Legacy PDFs will still be viewable, however they will open with the warning "This document enables Reader capabilities that are no longer enabled in this Reader version."[12]
• On March 10, 2009, Adobe Reader 9.1 was released which addresses a number of customer workflow issues and a critical security vulnerability while providing more stability.[13]
• On May 12, 2009, Adobe Reader 9.1.1 was released which addresses two critical security vulnerabilities.[14]
• On June 9, 2009, update version 9.1.2 was released which addresses a number of critical security vulnerabilities.[15]
• On July 31, 2009, update version 9.1.3 was released which addresses a number of critical security vulnerabilities.[16]
• On October 14, 2009, Adobe Acrobat 9.2 was released (added support for Windows 7 x86/x64 and fixed many security issues).[17]
• On January 12, 2010, Adobe Reader 9.3 was released which addresses a number of critical security vulnerabilities.[18]
• On February 16, 2010, Adobe Acrobat 9.3.1 was released which addresses two critical security vulnerabilities.[19]
• On April 13, 2010, Adobe Acrobat 9.3.2 was released which addresses several critical security vulnerabilities.[20]

Hi Kate1958. I found this for you. Do one or more of the following solutions:
Solution 1: Remove all versions of Acrobat or Reader, and then reinstall one version.
If multiple versions of Acrobat or Reader are installed on the system, remove all versions and then install only one version. See the documentation included with Windows for information about removing programs.
Note: If you need to have multiple versions of an Acrobat product installed, remove all versions and then reinstall them starting with the earliest, installing the latest version last.
Solution 2: Start Acrobat or Reader, and then open the PDF file in the web browser.
If an error occurs when you try to start Acrobat or Reader, refer to Related Documents below, or search the Adobe Support Knowledgebase:
-- If you use Acrobat, go to www.adobe.com/support/products/acrobat.html .
-- If you use Reader, go to www.adobe.com/support/products/acrreader.html .
Solution 3: Make sure that the External Window Handler file (ewh32.api) is in the Plug-ins folder.
If this file is missing, reinstall Acrobat or Adobe Reader.
The default location of the Plug-ins folder is:
-- For Acrobat: Program FilesAdobeAcrobat [version]Acrobat
-- For Reader: Program FilesAdobeAcrobat [version]Reader
Solution 4: Disable Web Browser Integration.
Disable Web Browser Integration so that PDF files open directly in Acrobat or Reader instead of in the web browser.
To disable Web Browser Integration in Acrobat 6.0.x -7.0.x or Reader 6.0.x -7.0.x:
1. Open Acrobat or Reader.
2. Choose Edit > Preferences > Internet.
3. Deselect Display PDF in Browser.
4. Click OK.
To disable Web Browser Integration in Acrobat 5.x or Acrobat Reader 5.x:
1. Open Acrobat or Acrobat Reader.
2. Choose Edit > Preferences > General.
3. Click Options in the list in the Preferences dialog box.
4. Deselect Display PDF in Browser.
5. Click OK.
To disable Web Browser Integration in Acrobat 4.x or Acrobat Reader 4.x:
1. Open Acrobat or Acrobat Reader.
2. Choose File > Preferences > General.
3. Deselect Web Browser Integration in the General Preferences dialog box.
4. Click OK.
I hope this helps. Please dont forget to rate and provide positive feedback for our fast-free support today. Thank you :D

Go to My Computer. Tools > Folder Options > File Types > Then Browse PDF Registered File Type . If you can see " Details for PDF extension " and you can see a change button, you can click that button and browse for your Acrobat Pro main program .

You need a PDF reader to open PDF files., Make sure that you have a program like ADOBE READER 9 installed which you may download from EN_US-H-GET-READER
or get FOXIT PDF READER from http://www.foxitsoftware.com/pdf/reader/