I have tried everything in this topice and I still get 6 errors everytime I open GP. The one time I Thought it was fixed there were no entries in GP. I am using build 14316.
The fix two posts above is for 10586.218 after installing KB3147458. You don't see the WindowsStore.admx file under c:\windows\policydefinitons in your configuration? If it's there it just has to be modified as explained in the fix. I suppose that it's possible that different items are causing your errors since it's a different build.
if you made an image of your hard drive for backup, you could within 20 to 45 minutes. Why a lot of us stress, BACKUP an image of systems before fartin around with these choke and gasps
Those are not the latest the latest are in latest rs1 insider builds they included one of those "WindowsStore.admx' in update KB3147458, but forgot to include the assocciated language file WindowsStore.adml so the appropiate fix is to use WindowsStore.adml from latest rs1 insider builds
After you have copied the new PolicyeDefinitions folder, you will notice that the Admin is now the owner, to change it back to the way it was: Right click on the PolicyDefinitions folder then go to Properties > Security > Advanced then change the owner to: NT SERVICE\TrustedInstaller