New
#11
As far as both machines go you can easily slap a clean install of 10 on each and solve any number of issues especially for the previously bugged up 8 to 8.1 likely "Anytime Upgrade" option many desktops and laptops have been seeing over the last sever years for Vista even as well as for 7, 8, likely 8.1 as well. With 10 however the ball game will be changing a bit.
As far as the laptop I had an HP 7 model here I ended up wiping the entire drive clean after removing the OEM 300mb, 3rd party 400mb, and System Reserved partitions but was unable to grow the OEM primary let alone move it any. That got dumped fast for a fresh primary with a nice clean install of 10 to finish that one off! That was after the upgrade, first 32bit clean install followed by the 64bit cliean install when that came up. I was trying to shrink the 7 to 10 primary down to see a new second backup partition when that came up.
Upon returning it to the owner it wouldn't connect to the web for some time and then one day it suddenly was on Bing! It took a first start ups at that location to get 10 to properly detect the WiFi there since the upgrade was seen to here connecting by way of the router.
As for the machine you pulled apart 10 may be seeing that as a major hardware change and deactivated itself as part of a new security measure MS put in. Rather then seeing the old watermark of "This is a counterfeit copy of Windows" as seen with 7 the main functions are locked out even when arriving at the normal looking desktop. Trying to boot up in Safe Mode however might allow you to get things going again if you are able to bring up the F8 options.