Occasionally folder permissions for Windows XP can become corrupted, resulting in the computer acting strangely – not accepting all group policies, not allowing some folders to be written to or miscellaneous application errors.
To set the local security permissions set back to default enter the following command:
secedit /configure /cfg %windir%\repair\secsetup.inf /db secsetup.sdb /verbose
You will need to be logged on as a local administrator.