First thing to verify is that your RoboHelp installation and
the project itself is on your local workstation.
Next, you can check file attributes on the files in Windows
Explorer to see if they are Read Only, and change them to Read /
Write. Right-Click on any file or folder in Windows Explorer, and
select Properties from the mouse menu. You will see and can change
the current attributes.
To add to what lmarden offers, it's often the case that if
you copy files from a read-only medium (such as CD-ROM) that the
attributes of the copied files are also carried along and the files
are then in a read-only state.