So, to verify the
current configs:
Desktop:
128GB SSD
Win 10 upgraded from Win 7
Laptop:
HDD
Preinstalled Win 10
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End state:
Desktop
New 500GB SSD
The same Win 10 Upgraded from Win 7 (but a clean install
Laptop:
The 128GB from the desktop, but with the original Win 10 install (probably clean install
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So...
On the laptop, create whatever factory reset DVD's it lets you make (this is for 'just in case')
Building the Desktop:
Download the MediaCreation tool from MS here:
https://www.microsoft.com/en-us/software-download/windows10
Create a DVD or USB install
Remove the 128GB from the desktop
Install the new 500GB SSD
Boot from the install media you made, and inntall the OS on the desktop
On activation, it should pick up the needed info from the motherboard and the MS servers and install
Building the laptop:
Remove the existing drive
Install the 128GB SSD
Boot from the install media, wiping out all partitions on it
Install the OS
It should pick up the license from the BIOS and activate no problem
If it fails, you have the fallback option of the Factory reset DVD you made earlier.