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mine is doing the exact same thing. I am getting the same error code and message. the only difference is I am running the x32 version.
I've confirmed that my friend's laptop does the same thing. My hunch is it's clearly Windows 10 update and even uninstalling that latest KB security update, store still keeps crashing upon opening.
Its a universal issue, Refer to this > Service Alert: Windows Store crashing on Windows 10 PCs and Mobile phone | Windows Central
Turn the auto set timer off then change time, then open store and changed time to auto, see if it works.
Followed this thread and issue resolved: Solved Windows 10 store Crashes - Windows 10 Forums