It seems, that you need partition manager software. I prefer Acronis Disk Director
It will take you 10 minutes to complete all operatitions.
So, first you need srink your partition, as you have only one partition 80GB. How much free space do you have?
Shrink all free space. On unpartitioned area create 2 partitions.
For example: if you have 30 GB with OS and apps (after shrinking), create another partition 50 GB. Then press "commit".
Now you can continue: copy first partition on second (note: both partitions are primary), press "commit". After that, you can delete old unneeded windows files from second partition, and apps data from first. Again use Disk Director: shrink first partition (from 30 GB till 10-15 GB, as you wish), resize second from 50 till 60-65> "commit"> and again shrink second from 65-till 30. At last on unpartitioned area create new logical partition (40 GB) for storage private data.
So, you'll have 3 partitions: 1-OS;2-apps;3-private data,
none of data will be lose, all programs will be copied correctly, and you wont need any key, it's very reliable program.
As you wish, in future you could reinstall only OS partition, and the other 2 will be saved!