If you can set the DVD drive to boot first you should be able to set the SSD to do so in BIOS setup.
See if you can set the SSD as Primary, then set it to boot first in BIOS boot order listings.
Then disable the HD in BIOS setup or remove it to Clean Reinstall - Factory OEM Windows 7.
Afterwards re-enable the HD, click on it's User folders to add to the related Library - Include a Folder
Later when you're ready to delete the old OS on HD, move the User folders and other data off to delete it's partition in Disk Mgmt, create a new one to move data back on, link to Libraries.