I have 2 installations of Windows 7 using 2 copies of Windows 7 upgrade. I need to reinstall one of them with SSD but I am not sure which one is used on which. I have the product key labels on both of my install disks' package. Is there a way to tell which product key is used on which PC without installing any software?
I've used belarc for a decade or so... I'd check them out... I would be a little more mistrusting of the "magicjellybean" one ... not to say its bad but from your response of mistrusting keyfinders, you seem to have had issues in the past with game key finders that are full of malware. Finding the windows/office keys are generally not the same thing.
Nirsoft ProduKey is good. it pulls the OS key and any other keys, like Office that are on your machine. if you've got time to run an uninstalled key extractor, you've got time to run this and then uninstall it.