Problems displaying PDF files in browser - Help requested

The scenario is that I visit a website that has information available via a link that normally would open a PDF document in a browser window.  The sort of document, that once open, if I clicked 'File-save as' in the browser would immediately save as a PDF file.  In the current situation I click on the link and all I get that opens is a screen full of random characters from top to bottom.  I have tried right click 'file save as' on the link that would open the PDF in the browser, but all it wants to save is a .PNG file, i.e. http://echa.europa.eu/echa-styled-theme/images/doc_lang/en.png - which is what I get from right click 'properties' on that link which should open the PDF in the brawser - normally I would see a .PDF file described. I therefore can't even download the file to open as a PDF direct from a stored location on my own PC - all it seems to see is the graphics format - this probably why when the browser goes to open the PDF file I get the random characters, i.e. the application is doing its best to translate what it does see.  I would be grateful for some advice.  Pertinant information follows:
1.  It happens across more websites than just one example that I've quoted.
2.  It happens on my desktop only - I don't have the problem on 4 other portable computers, including ones running the same O/S
3.  Desktop is running Windows Home Pro, all updates executed, running the latest version of Acrobat reader with all updates executed - I tried yet another uninstall, reboot, new download, reinstall, reboot etc. yesterday.  Desktop is HP Pavillion with 12GB RAM
4.  I get the random character display when running IE9 on the desktop, I have also replicated the problem with other versions of IE installed instead.  If I try using Chrome as a browser it goes away and tries and just fails to open the link entirely and reverts to the original page.
5.  I've already checked online for similar problems and can confirm that all the Adobe plugins are installed per what seems standard advice I have also checked the internet settings in Adobe Acrobat preferences and all seems fine.
6.  Thing like the browsers and Adobe arobat are running as per their standard set-ups with nothing else done to these.
7.  Any other PDF files stored on the hard drive of the desktop open in Acrobat reader without problems
8.  Acrobat reader version is 11.0.06.70
Any assistance to open the PDF files in the browser and get it working particularly with IE would be great, I am quite IT literate and can try most things.  Many thanks

Moderator
I have no idea how to edit the above message, but apparently it has been rejected.  I cannot understand why, I am a regular contributor in many forums and have never suffered the indignity of having had a message rejected before.  The message contains an excellent example of the problems I am having in the following link Vacancies
How on earth can I demonstrate the problems I am having without being to post an example - that example has both sorts of links on one page, ones I can open and ones I can't - if anyone with technical knowledge is trying to help me then that is just the sort of page that would be useful to help solve the problem.  Rather than the link to the ECHA website in the above posting (which I note was approved).  I struggle with your logic in accepting one message and rejecting the other.  It is difficult enough as a user to describe a problem in words let alone have the best example of the problem rejected without explanation and no right of appeal on the email that I got telling me.  Not happy here!   All I am trying to do is to solve the problem I have

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    Installed: Acrobat Reader 9 and Acrobat 6.0 Professional
    Up until recently, when an update from MS and adobe were installed, Internet Explorer 7 has been displaying PDF files when clicking on a link to the document. I do not know which company is at fault for compatibility here, but I would prefer to have IE7 read/save PDF docs. As it is now, an window pops up (no error number) saying "The Adobe Acrobat/Reader that is running can not be used to view PDF files in a Web Browser. Adobe Acrobat/Reader version 8 or 9 is required. Please exit and try again." I click the OK button then Acrobat 6.0 Pro loads and with no document showing. Simply turns on. I open any PDF file manually using either Reader 9 or Pro 6, but IE7 will only come up with above msg.
    Corrective actions attempted were:
    1) Reinstall Reader 9 on top of itself.
    2) In Pro 6, Edit | Preferences | Internet and deselected "Display PDF in browser, restarted program, went back to re-select it, restarted program.
    I did notice a new process running named: wisptis.exe
    The error message above sounds more like to me that the Pro is assigned the job to read downloaded PDF files, but with the Web Browser Option set to "Display PDF in browswer", I do not know why IE7 is not reading them.
    Thank you for your help in advance.
    Kay

    Try troubleshooting the Safari .plist file.
    Quit Safari.
    Open a Finder window. Select your Home Folder in the Sidebar on the left. It has a small house icon. Then open the Library folder then the Preferences folder.
    Move the com.apple.Safari.plist file from the Preferences folder to the Desktop.
    Launch Safari. See if that made a difference.
    Also, check Safari / Preferences - Extensions. Make sure it's not an Extension preventing PDF's from rendering.

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