How do I copy files from Windows partition to my Ubuntu partition

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http://askubuntu.com – I am dual-booting Windows 7 and Ubuntu and I have many important files on my Windows OS. I've been trying to copy the files from windows to my Ubuntu home directory but the paste option is disabled when I rt click in my home dir. How can I copy the files? What is the command to copy files from my D drive if using console with sudo? (HowTos)