David,
Please download the control again,
Add this to web.config <configuration> <appSettings>
<add key="CuteWebUI.AjaxUploader.WindowsUsername" value="Terry" />
<add key="CuteWebUI.AjaxUploader.WindowsPassword" value="12345abcde" />
<add key="CuteWebUI.AjaxUploader.WindowsDomain" value="" />
Your application need <trust level="Full" /> for this option
Regards,
Terry