It might be worth looking at the free to download Clonezilla http://www.clonezilla.org/
However Mirai HD Clone would be somewhat easier to use and there is a free edition http://www.miray.de/products/sat.hdclone.html#versions
. You can go the bootable optical disk route with HD Clone just like the other hard drive copiers/imagers. Alternatively the Mirai product can be run from within Windows itself, including Windows 7. This is feature of all the versions so you could try it with the free release.