iTunes and Win 10 problem with app store

[Davidm]

FYI: My friend has had nothing but problems with the App Store not loading on his 6s. He gets update page but no new apps to download. He has spent hours with Apple support and did everything including restores etc. yesterday he was again on phone with Apple as each time they fix it the next day it's back, if not sooner. The latest fix is they claim upgrading to Win 10 screws up current install of ITunes. They had him uninstall iTunes, reinstall and then restore iPhone. So far next day it's still there. Has anybody else found this to be true?