OK.
Then: copy all data other than games from HDD to the external.
Make sure you have some way to reinstall games and any other applications you will need.
Disconnect HDD. Connect SSD.
Install Windows to the SSD. Update Windows, get anti-virus running, confirm that all is running well.
Copy data back from the external to the SSD.
Reconnect HDD. Delete all partitions from it.
Make one new partition on the HDD. Install games to it.
You delete all partitions in Windows Disk Management.
The drive will then be empty, like when you bought it.
Then create a new partition in Windows Disk Management and format it.
Then install games to it.
What you need to do is delete anything that you do not need from your HDD run a disk defragment program (auslogics free) and a disk cleanup(C -> properties and disk cleanup) and see how much of the volume is in use. Then buy a SSD big enough to fit all the data from the HDD on it. For example after getting rid of junk files you have 80Gb in use buy a 120Gb SSD etc. Then use the free norton cloning software [corsair SSD](or other free cloning software you can find online) which comes with the drive to clone your current hdd on to the SSD. Then all you need to do is swap out the HDD with the SSD and boot up your pc. By using this method you will not have to install anything as your windows 7 os, games and other software will be there waiting for you after the swap out and you will find everything as you left it. You will see a increase in speed across all program's installed on the SSD. You can then format the old HDD and us it as storage.
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