Photo won't open but displays photos on the start screen,

Mail Says it cannot sync,

Calendar is hit and miss with syncing,

Photo Gallery won't open,

Windows Media Player doesn't recognise where my music files are.

All the above programs were working fine(ish) and then for no apparent reason they all started playing up/stopped working, even though no settings were changed.

(Mail has always been glitchy)

Using Windows 8.1 (Windows 7 + Windows 8 upgrade disc + Windows 8.1 upgrade through the Store)

So there I was flicking through my photos with Photo Gallery when all of a sudden and without warning they all disappeared. Every single one of them.

It then brought up a dialogue box citing error code 0x8007000b.

Then I tried to access the photographs with the Windows 8.1 Photos App but that couldn't find them either, (even though the app had showed them 10 minutes earlier) citing a dialogue box saying "pictures.library-ms" is no longer working. This library can be safely deleted from your PC. Folders that have been included will not be affected.

Both programs had been working fine and no changes had been made to any settings etc..

I have un-installed and re-installed Photo gallery but it continues to give code 0x8007000b and will not open.

It doesn't look as though the Photos app can be un-installed either.?.

The photos are stored both on my computer and Skydrive. Thankfully Skydrive hasn't lost them.

Also all of my music has disappeared from Windows Media Player.

Why is there no facility to repair these apps when they crash; Mail, Calendar and people etc.?

There is only so many times you can reformat your hard drive, and it is a pain when you don't just have the 8.1 disc but have to do this: Using Windows 8.1 (Windows 7 + Windows 8 upgrade disc + Windows 8.1 upgrade through the Store)

Your help would be appreciated.

John