App can't be opened using the built-in administrator account.  

I was getting UAC shields appearing on some of the icons. I found the solution how to get rid of them by going to the "Local Security Policy" > Local Policies > Security Options and disabling:
User Account Control: Run all administrators in Admin Approval Mode
User Account Control: Admin Approval Mode for the Built-in Administrator account

And of course I ran into the bigger issue. I can't open any windows related app. This is what is says (see above). If I re-enable the policy, the programs work again, but the shields appear again. I really don't want them and they bother me and as far as I have researched this is the only solution I found that is working.
Now back to the blue message. I have tried creating a new user and giving it admin rights. Still got the blue message. Then I tried disabling the built-in administrator with this method here. Restarted PC, still the same result.
I really ran out of options. Can somebody smarter than me please help me resolve this problem.
I'm running Windows 10 Pro.
My Local Security Policy list here

P.S. I did not upgrage to Windows 10 from earlier versions, I built PC from scratch and booted from usb.

Follow up!
People have suggested me to reinstall windows/do a clean install. So I did create a new bootable usb with completely different build and got the same result.

I think that this is a huge flaw with windows 10 and I'm really looking forward to solving this issue. Smartest people here please help me!
Also note that I'm not using Built-in administrator account. I'm local Administrator.

Lazarus23 said:

Yes, I'm running with built-in administrator. Please tell me how do I get rid of it?

Built-in administrator can in no circumstances run Windows apps, only exception being the Settings app. You need to create a normal user account to yourself, make it a local admin and use it instead.

• Create a new user account: User Account - Add in Windows 10 - Windows 10 Forums
• Make it local admin: Account Type - Change in Windows 10 - Windows 10 Forums

To create yourself a new user account and change its type to local administrator, links to tutorials in my previous post. When done disable the built-in admin account: Administrator account - Enable or Disable in Windows 10 - Windows 10 Forums

Lazarus23 said:

Ok this is what I did.
1. Created new user.
2. Made it administrator
3. Made old user standart
4. Disabled built-in administrator (did all the options).
5. Restarted PC.
Still same b******t.

Please tell did you clean install Windows 10 or upgrade from Windows 7? Some Windows 7 users decided that they do not need stupid Microsoft to tell them what they can do and what not, and feeling like Masters of the Universe they enabled built-in admin account using it as their only user account. A stupid thing to do, of course.

These users will automatically get issues when upgrading to Windows 10; the upgrade process sees an existing user account not detecting it is the built-in admin, upgrading to 10. Because Windows 8 and later use MS accounts, too, the system has evolved and you simply cannot use built-in admin anymore as your daily, only user account.

If that's your case then my sincere advice and recommendation is to clean install Windows 10.