Check whether you have Full rights in C Drive. Open my computerClick on C
DriveDo Right ClickPropertiesSecurityGroup or User NamesClick Users
now in Permission for Users check whether do you have Full Control on it or
Write Permission Check box is having a tick mark. If you dont have the
Necessary Write permission in C Drive then it is not excel problem, its
caused due to Network Security Rights issue and this can be solved by the
Administrator password by giving the appropriate rights on accessing the C
Drive.

Remember to Click Yes, if this post helps!

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(Ms-Exl-Learner)
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"Biyi" wrote:

AppTrying to add data to an existing Excel 2007 Workbook. Keep getting a
dialog box stating 'Your AutoCorrect file
c:\users\......\AppData\Roaming\Microsoft\Office\M SO2057.ad, could not be
saved. The file may be read only, or you may not have permission to modify
it.' Notice the same thing while trying to reply a mail in Outlook. Cant
remember having changed any settings recently or made any document read only.
What did I do wrong and how to resolve the problem? thanks.