Windows 10: I changed hardware on my PC now it tells me windows isn't activated

I recently changed almost my whole computer hardware. It now tells me that windows isn't activated I've tried troubleshooting.

:)

 

windows activation—hardware changed siginficantly

From time to time on my thoroughbred PC, I get a Windows activation message that says my hardware changed siginificantly and I have to re-activate Windows. My hardware hasn't changed any more than a network card (went from a wireless g card to onboard lan to a wired network card), and the install is legit. Why is it doing this, and how can I stop it?

 

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.

 

Windows can´t activate after hardware change.

Yesterday I made a major hardware change (I changed motherboard, processor, Ram, and CPU Cooler) and when I started My PC I realized that Windows 10 was not activated.
Then I went into configuration, activation, troubleshooting and there I selected change hardware recently, even so, windows

said it can not be done because the servers are not available.
The same step I did yesterday and today. Solutions?

***Post moved by the moderator to the appropriate forum category.***