Recently I’ve been using this tool to transfer large files – usually from clients old computers when they are upgrading to a new computer and transferring everything across, or backing things up for safekeeping – or even from pc to mac or mac to pc. When dealing with many gigabytes of files, its a real pain of the windows Copy feature gets stuck. This one can resume and it is much quicker when copying files through xp or vista and probably faster for windows 7 too. Windows 8 apparently is alot faster with its internal copy function so depending on how many files you have top copy or transfer it may be worth it.
Anyway the program is called “Teracopy” and you can find it here: