A family of Microsoft relational database management systems designed for ease of use.
You can verify that Windows is really allowing you full access (if Server 2008 is like Server 2003):
Right-click on the file, choose Properties, choose the Security tab, click the Advanced button, choose the Effective Permissions tab, click the Select button, type in your username, click the Check Names button, click the OK button. It will show you what permissions Windows is really giving you.
Jay