App updates failing. Help needed

After upgrading my Win7 pc i've been using Win 8 and starting to get used to it. Really like it so far!

After installation 13 apps needed to be upgraded, but they failed. After upgrading the OS and trying some fixes I still have 4 app updates that just will not come through. i can install new apps. Any ideas? among others It's the Music app, video app.. Also tried deinstalling the music app but it won't install again.

Help appreciated!