Can't open downloaded files

Help! I can't open downloads from the internet or e-mail in preview. It seems to be happening with both pdfs and jpegs. It just started yesterday, and I'm not sure why. It gives me a message stating that the file may be corrupted or the wrong file type. The file type is not wrong, and it says this for files from any source even trusted ones. Any help is much appreciated!!

HI,
Assuming you are using Safari... try maintenance.
From the Safari Menu Bar, click Safari/Reset Safari. Select the top 5 buttons then cick Reset.
From the Safari Menu Bar, click Safari/Empty Cache.
Quit Safari.
Go to Home/Library/Caches/Safari and delete all the sub-folders within that one.
Go to Home/Library/Safari and delete any of these files you have there:
• Downloads.plist
• History.plist
• LastSession.plist
Restart Safari.
Carolyn

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