If you aren't re-installing Windows or anything, you should just be able to have the 120GB SSD as another drive. If you already have it configured with the 64GB SSD as C: and the 1TB as D: it would be best to just add the 120GB as E: and just install/move your preferred games there.
Yes, It's that simple. Plop it in jasas any other HDD, go to disk manager:
.. Initialize it - Partion it and formate it.
.. Then start using it
Please NOTE, I do Not recommend a 64 Gig SSD as a OS + Program drive - Yes it will work.
64 Gig SSD = 60 Gigs formated - 20 % UNUSED = 48 gigs Usable space.
On the 20% This is to allow Wear leveling, Garbage Collector (GC), and TRIM to work their magic (PS Recommended free space use to be 10%, was found that this really was not enough).
HOWEVER, This is what I would do:
1) go to control panel -> backup and on left side click on create an image of system drive. Windows should select your HDD (root directory) - good place.
When done windows will prompt you to create a"Repair disk", don't have to if you have a windows 7 Install Disk.
2) When Done, disconnect SSD and connect new SSD.
3) Boot to either the Repair disk or Windows Install Disk. Select repair, then rstore using an image file.
.. Windows will search for the image, find it on the HDD and ask if that is correct.
4) 15 Minutes later, it will be done!! Reboot to the New SSD - EVERYTHING will be as it was.
NOTE: One aditionl step, since this is a exact image of Old SSD you will see your New SSD partitioned. NO PROBLEM:
.. Just go to disk management (right click my computer and select manage, then disk management.
---- Rt Click the SSD and Expand to FULL size
*** Walla-bang-thank you Ma* - Done, well almost
.. Power down re-connect Old SSD, (make sure BIOS is set to New SSD) Power up and reformate OLD SSD and use this as your 2nd SSD.