Windows 10: Properly "killing" an older W10 installation

I just put in a new SSD and have been in the process of transferring and reinstalling files and apps from my older Win 10 main hard drive to the new SSD. Through the UEFI Bios, I can still boot into either old or new disk but I notice that there may be increasing glitches at the hardware level as I move from drive to drive.
I would like to deactivate the Win 10 aspect of the old drive. Then I could open it from the new drive and copy data to its new home.
Am I correct in guessing that even when the old main drive is not booted, it's presence might still cause problems because of its hardware and driver interactions? One thought I have is to fully back up the old drive to my spacious backup drive, then pick up the pieces I might need later from there. I use Macrium Reflect for backup, so I can break out individual files, although it is more difficult than copying them from their present location.
I feel like I am making this too complex, but I don't want to rush and wipe out data I might need.

:)

 

" SOFTWARE UPDATE FAILED "

SO HERE'S THE LINK TO THAT PIC

http://i26.tinypic.com/2ihbdco.jpg

CAN U PLZ CHECK IT ACTUALLY I HAVE USED THE NOKIA SOFTWARE UPDATER B4 ... BUT I DONT KNW WHY I M GETTING THIS ERROR NOW

 

" SOFTWARE UPDATE FAILED "

i have installed windows xp sp2

previously i was using windows media center i thought i might b facing this probs due to that but then i changed it to windows xp ! n moreover i have also shown to nokia service center executives but they were not having the latest updates available ......
my pc suite is showing that new update version of firmware is available but i cudnt download it

oh gawd wat to do ?

i tried in another pc then again i got an error u need to have minimum 256 ram

please cant it b rectified ? there must b any solution to this probs please help me guyz

god bless all of u thanx

 

Best way would be to back up all files you need from that old drive somewhere else and than delete all partitions from it because you will not need them for data drive and they are just taking space. You can re-partition it at will and return files to it from the backup.