@ smuck:
You may try the following:
- Do a backup of all current SSD partitions and store it somewhere outside the SSD.
- Download an actual ISO file of the tool "Parted Magic" and create a bootable USB flash drive with it.
- Boot off the Parted Magic USB flash drive and let the tool do a "Secure Erase" of your SSD (if needed, follow the advice of Parted Magic and send the SSD into the "sleep mode").
- Restart the computer and retry to get Windows 7 installed.