I tinkered around quite a bit (using the latest Insider build 10525) and finally got to the place where the Windows store apps would not run (instantly close when clicked - no error message - the store tiles are "greyed out" etc). A few apps (like Einstein quotes app) still work but the majority do not). Is there any way to reinitalize the store. Its not the highest priority for me since Edge still works and I can wait for the next Insider build which will fix it but it would be nice.