None of my Windows 8 apps are working

sounds like you either have malware or something is blocking access like bad firewall rules.(this wont affect the ui but can stop you connecting to the store)
if you can run malware bytes and see if anything pops up. if you cant run it from the desktop then try emsi softs rescue kit, it runs off a usb outside of windows so should be able to run regardless of the condidition of your o.s.
https://www.emsisoft.com/en/software/eek/ its just as effective as malware bytes.
 

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