Windows has never been particularly fast or flexible at copying files. Copying a large file from one drive to another, or even from one location to another on the same drive, is much slower than when performing the same operation from a command prompt. Even before the copy starts, Windows spends ages discovering and calculating how much data it needs to move.
Teracopy is a great program for moving or copying files around your computer. It has a friendly graphical interface, it's very fast, and the program is free for home use. You'll find the download at http://www.codesector.com/teracopy and it's a 4.3 MB file. It's malware-free according to VirusTotal, and is rated as reputable by Web of Trust.
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