Windows 10: How to activate Windows when the reactivate tool isn't working.

HeyI have a windows 10 upgrade from Win7 way back in the day, so I don't have a serial number for win 10 but my device shows as Default String on my MS devices which to my knowledge means it is activated, but simply doesn't have a key.When I recently changed my hardware, Windows has lost the activation. I changed my motherboard, cpu and memory. The device showing on my MS account shows the new hardware after the upgrade with the activation, but somehow this isn't translating to activation on my device.I've tried endlessly to get in contact with an agent to get this resolved, and I've used the

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UNABLE TO ACTIVATE WINDOWS AND NUM LOCK ISN"T WORKING

UNABLE TO ACTIVATE WINDOWS IN SYSTEM AS WELL AS NUM LOCK ISN"T WORKING

 

Printer isn´t working after latest update.

After the latest update from Windows, my Canon Pixma ip6600 printer isnt working. In Device Manager it shows up as working properly but when I go to print it isn´t listed as an option in any programs. Troubleshoot suggests it´s a USB 2 printer on a USB
3 port and that that´s the problem but that cant be since it worked fine before the update. I´ve tried to uninstall and plug it back in but that doesn´t work either.

 

Cortana isn´t working

When I hit enter, it did something, but there´s still no Cortana, even after restart. So I tried it again, but now it says that it failed, because it´s already installed and it´s working in PC. So it should work, but Cortana still isn´t here.