You need to do a fresh install of Win7 to boot from the SSD. During the install process, select the SSD as the drive to install it one.... Afterwards, select it to boot from first in your BIOS...
On a side note.... The reason you can't see it now is it isn't formated. You would need to go into your "Manager" folder (right click on "Computer" in Start menu to select it) and access Disk Management from there. You'll see the drive is unassigned and unformatted (black).