If you are using Windows 7, or even 8 and get a message that you cannot save a file to c drive then try doing this:
1. Run->secpol.msc
2. Local Policies->Security Options.
3. Set “User Account Control: Run all administrators in Admin Approval Mode” to Disable.
4. Restart the computer.
This should do the trick.
Ref: https://www.eightforums.com/general-support/39036-cant-save-file-c-despite-changing-ownership-access.html