Help! Message "pdf could not be saved because an unknown error occurred. Try saving to a different l

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i had contents of (dying) ibook transferred onto emac. tech created new user/desktop on emac. now, when try open pdf files website, drop down window saying this:

"downloading - users/myname/desktop/xxxxx.pdf not saved because unknown error occurred. try saving different location."

points note: 1) "xxxxx.pdf" part of above message changes each time try open pdf document, same one, , not show real name of document (e.g. collegeapplication.pdf). xxxxx.pdf written gibberish, "86hgkjh.pdf" or "sdfj99f.pdf."
2) never happened on laptop;
3) settings set in firefox download pdf's desktop;
4) have latest version of adobe reader, tried opening before downloading;
5) settings set open pdfs using adobe.

i had same problem when installed firefox 3, think problem due recent hard drive upgrade. try changing download location "desktop" in microsoft internet explorer , other browsers (safari, firefox, etc.) whatever default location prefer. never use internet explorer, think somehow settings corrupted when upgraded hard drive. found solution on site also.


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