Do you have administrative status on your login account? If not it is possible that this is the cause and can be fixed in user accounts section of the control panel.
Otherwise your permission settings are likely incorrect for some reason. Any number of things can cause this. Starting with the file itself, right click on it and go to properties then select the security tab. Under the group and user names look for you login id then select it. Once selected look at the permissions for users pane and see which boxes are checked. Read & execute, read and write should have a greyed out check mark beside them, if not then use the modify button and make the needed change. If you do not see your login id listed here then use the modify button and add it to the list. If this is set correctly then cancel out of these windows.
Changing this file alone may not solve the problem but you can repeat the process on the root folder and likely correct the issue if needed.
If you do this be very careful as you can easily make things worse.
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