Follow these steps to get a perfect Clean Reinstall - Factory OEM Windows 7.
Otherwise you can try shrinking the Win7 partition to get it as small as possible so it will fit onto the SSD, then save externally a backup image to use to reimage to the SSD:
Backup Complete Computer - Create an Image Backup
System Image Recovery
Another option is to clone the HD to SSD using Acronis premium cloning app which comes free if you have any WD or Seagate HD in the mix.
Finally read over these steps to give you more options: SSD - Install and transfer the Operating System