Windows 7 USB/DVD Download Tool (WUDT) is unable to copy files

http://4sysops.com/archives/windows-7-usbdvd-download-tool-wudt-is-unable-to-copy-files/

This post explains why the Windows 7 USB/DVD Download Tool (WUDT) is unable to copy the install files to the USB drive in some cases. The tool allows you to create a copy of your Windows 7 ISO file on a USB flash drive.