All windows apps are not opening

so i accidentaly uninstalled some important windows app that i didn't know that crashes all windows system apps including camera ,store ,clock and all windows system apps. i tried searching online on how to reinstall it and said i have to enter some random powershell administraitor and kept failed it said that the file was not found so i was very dissapointed and angry and fraustrated and dont know what to do and the only way is to find some windows installer. if one of you guys or alot of you have those windows installer i would apperciate you if you gave the installer for windows system apps
 
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