Windows 10: How to install the "app package installer" for windows 10

I recently installed Windows 10 on my laptop and tried to install a appx file But it just says "How do you want to open this file"Since my windows 10 Microsoft store isn't working I think I need to install the app package installer first but I don't know how

:)

 

Windows 10 installing progs

I decided to take the plunge and upgrade to windows 10 from 7. I used the Media Creation Tool from MS website. It took awhile, but I am finally running Windows 10 (12-14).

I opened the new App & Program feature to remove programs that I no longer needed. Scrolling down the list, I was horrified! Apps that I didn't install somehow magically installed themselves. Two programs stood out: Facebook and Candy Crush Soda Saga. Both programs have those tale-tale icons that they came from Windows Store (which I've never even opened). The install date for both of them were on 12-26.

Is this a common thing for Windows 10? Or is it because I did an upgrade and not a clean install?

 

Windows 10 installing progs

You did an upgrade.

 

windows xp installation and dual core am

could someone please list the steps they follow to install windows with a dual core processor and windows xp service pack to. I'm reletively new to amd dual core and i feel i'm missing a step. All help will be appreciated. thanx