Unable to download new apps or run existing ones.

I can only run apps when NOT connected to the internet. Only pre installed apps becauce I can't download new ones.
When connected to the internet I can
use a browser, use email and go to the apps store.
If I try to run any apps they try to open up and then I get the message "Can't log into Xbox" or something like that. I DON'T HAVE AN XBOX. Why do microsoft assume everyone owns all of their products.
I have uninstalled everything mention of Xbox but this get the same problem.

I tried to download an app - three days later it was still trying. I just get a blank square on the home screen with some dots scrolling along the bottom of the box. I have tried various apps and nothing ever downloads.

Can anyone shed any light on this.

My Details

Just realised you might not be able to see my profile containing hardware details.
Acer Laptop
Windows 8.1 Version 6.3.9600 Build 9600
i7-3632QM CPU
16gb Memory
No Antivirus Software or port blocking software.