Hey Stephen (and of course thousands of other upset users), here's the scoop that I received from an MS tech support a few nights ago after many long and frustrating nights trying to get the apps (initially), and now also the Store app itself, working....
Microsoft continues to push through updates, many of which are "new features" which they in their typical misguided fashion decide arbitrarily that we want. Unfortunately, in doing so, the computers which in many cases are a few years old (2 or more) are
no longer capable of handling these "new features", which as a result "breaks" everything.
In my case, I have a 4 year old HP laptop, which was running Windows 7. When the Windows 10 "upgrade" was offered, I naturally signed up to try it out and as part of the process checked my system using Microsoft's OWN compatibility checker, which told me
that my system (although the model was not specifically tested by MS) should work fine with Windows 10 based on the hardware capabilities. The "new features" which I was forced to download on December 15th, apparently make my system NO LONGER compatible, so
I've now lost many default features such as the calculator, and no ability to fix this, short of wiping my system and losing four years of accumulated files (as backup of 500Gb is not possible due to time and cost). I was told by the MS representative that
basically my system was no longer viable with Windows 10...oh, so sorry, but just the way it is.
The way I see this, Microsoft provided a product under specific terms and is now changing those terms arbitrarily after the fact, which in my opinion constitutes misleading marketing or possibly even fraud. The equivalent of what Microsoft is doing would
be an individual buying a new car (with your own personal color and options choices). A few weeks later, the dealer comes by in the middle of the night and changes your car options and color completely (and also shorts the computer and electronics circuits
in the process) assuming that "you'll like these MUCH better. They've broken your car and are accepting no responsibility for it!
As far as I'm concerned, I've had enough of Microsofts **** (used it since DOS 1 and been seeing it go downhill since Windows 3.1). I'm now searching for a new system which I will install Linux and NEVER EVER look back.