Windows 10: I've recently bought windows 10 which isn't working

ive recently bought windows 10 with and activation key, but I'm not getting full access to my settings I received this error when i put the code in Windows 10 activation error 0xC004F050

:)

 

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.

 

The sound isn´t working

It was working normaly, but sudenly it got stucked so i turned it off, when y turned it on i got really scared, because it wasn´t working, i´ve checked everything, but it still doesn´t work, and even i can´t do skype calls. What do i do?