Why can't I open my pdf files?

I suddenly started getting a file conversion window asking me about Windows, MS-DOS, and other encoding when I try to open a file! What have I messed up????
Please help!!!

Okay, I checked that and I could open the file when it said open with Adobe Reader. I guess I should have said when I tried to open something from the internet it gave me the file conversion window. Thanks so much for your help. I was able to view what I needed.

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I tried that.
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Thank you Pat,
I have already been there done that. I first Un-installed all of my adobe freeware (reader, flash player, air. etc) then started reinstalling. First I reinstalled reader (latest version Reader X), same error messages. added AIR (latest version not listed - Last updated April 1st, 2012 -
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when I reset the default to the normal red Icon everything began to work just as I have always had adobe reader work. Now I have no clue how or when I picked up the "Acrobat.com" program even worse it does not show up under programs on the control panel. When I have a few moments this evening, I will run a search for "Acrobat.com" & hopefully be able to remove it from my computer.
Bottom line I don't know how I got the program which seems to have caused the breakdown of adobe reader but by resetting the default program to open PDF files it is now working as it should
Thanks for the suggestion.
Sincerely,
Richard L. Cornick
Contact information: Cell (562) 522-5504; Fax: (562) 531-0684

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Back up all data.
Triple-click the line of text below to select it, the copy the selected text to the Clipboard (command-C):
/Library/Internet Plug-ins
In the Finder, select
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~/Library/Internet Plug-ins
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Why can't I open my pdf files?

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