UPDATE - I had an existing Dell Studio XPS 7100 with Win7 Pro x64 Sp1 and have built a new PC. I had a relatively new 500GB Samsung SSD in the Dell, but needed a much bigger drive in the new build. I tried using a 1TB Crucial SSD and purchased a NEW OEM disc and key for the new computer, since everyone said I can't transfer the old Win7 OEM key.
I had made TONS of modifications to the Windows system and really didn't want to have to go through copying over all the things necessary to completely redo all that. But nevertheless, all the experts on several forums stated that no way would it work to do what I wanted to do, which was to simply take the old Samsung SSD out of the Dell unit, plug it into the new build, then change the product key. SO I set about doing it the painful way. Starting with the Blank NEW 1TB SSD and the new Windows boot disk, I loaded Windows on the new machine, loaded all the drivers, and started doing all my tweaks, and got to my email program which is also a pain in the @$$ to move. No luck whatsoever getting Vivaldi to save my info, even copying the full profile over.
SO, out of frustration. I shut it down, yanked the 1TB drive out, and got my old Samsung SSD out of the Dell and plugged it in in place of it. It booted just fine. Immediately I got the warning that my copies of windows did not appear to be genuine, and a pop-up box with options to reload a new product key to re-validate. I typed in the NEW key code from the NEW windows OEM disk, and whadaya know, everything worked beautifully.
I then cleaned the Crucial drive, and removed everything from it, and ran it plugged into the old machine's power, but not the SATA connector, for the recommended 8 hours to allow the "Garbage Collector" built into the disk to reset everything to blank, like new condition.
I then loaded the cleaned drive in the #2 bay slot in my new machine, and downloaded the free cloning software for the Crucial drive from Acronis. I ran the clone operation, and it took about 30 minutes. I then had a new 1TB drive fully loaded with all my existing stuff, didn't have to reinstall anything, and everything works great.
I'm now taking the 500GB Samsung drive with all the info still on it, reinstalling it in the Dell machine, and re-validating the Windows with the original OEM Dell product key.
So, the way to do all this was to load the NEW windows OEM disk onto the new machine using the new 1TB Drive to activate it, and key it to the new mobo, then remove that drive, swap it with the 500GB existing SSD from my Dell, enter the NEW product key when prompted to re-validate, then cleaning the 1TB drive completely, reloading it as the number two drive in the new machine, then using the free Acronis software that came with the new Crucial drive, to clone the old drive over to the bigger new one.
Responses below were from the original question if not dated after today 6-18-18
I had made TONS of modifications to the Windows system and really didn't want to have to go through copying over all the things necessary to completely redo all that. But nevertheless, all the experts on several forums stated that no way would it work to do what I wanted to do, which was to simply take the old Samsung SSD out of the Dell unit, plug it into the new build, then change the product key. SO I set about doing it the painful way. Starting with the Blank NEW 1TB SSD and the new Windows boot disk, I loaded Windows on the new machine, loaded all the drivers, and started doing all my tweaks, and got to my email program which is also a pain in the @$$ to move. No luck whatsoever getting Vivaldi to save my info, even copying the full profile over.
SO, out of frustration. I shut it down, yanked the 1TB drive out, and got my old Samsung SSD out of the Dell and plugged it in in place of it. It booted just fine. Immediately I got the warning that my copies of windows did not appear to be genuine, and a pop-up box with options to reload a new product key to re-validate. I typed in the NEW key code from the NEW windows OEM disk, and whadaya know, everything worked beautifully.
I then cleaned the Crucial drive, and removed everything from it, and ran it plugged into the old machine's power, but not the SATA connector, for the recommended 8 hours to allow the "Garbage Collector" built into the disk to reset everything to blank, like new condition.
I then loaded the cleaned drive in the #2 bay slot in my new machine, and downloaded the free cloning software for the Crucial drive from Acronis. I ran the clone operation, and it took about 30 minutes. I then had a new 1TB drive fully loaded with all my existing stuff, didn't have to reinstall anything, and everything works great.
I'm now taking the 500GB Samsung drive with all the info still on it, reinstalling it in the Dell machine, and re-validating the Windows with the original OEM Dell product key.
So, the way to do all this was to load the NEW windows OEM disk onto the new machine using the new 1TB Drive to activate it, and key it to the new mobo, then remove that drive, swap it with the 500GB existing SSD from my Dell, enter the NEW product key when prompted to re-validate, then cleaning the 1TB drive completely, reloading it as the number two drive in the new machine, then using the free Acronis software that came with the new Crucial drive, to clone the old drive over to the bigger new one.
Responses below were from the original question if not dated after today 6-18-18