I'm having problems synching my Skydrive account on one PC which has the Skydrive app installed.  I've tried many of the suggested remedies such as re-installing the app, trying an alternative DNS server, and moving most of the folders/files out of the Skydrive folder and trying to sync again. 

When I start Skydrive from Start Menu item an app briefly shows up in the icons and notifications area of the Taskbar and a message flags up to say that Skydrive is running and a windows showing the contents of the Skydrive folder opens . But the app icon remains visible only whilst I am not signed in to Skydrive, ie for a few seconds. Once (signed in apparently ) the icon then disappears and I can no longer change any of the Skydrive settings. Alternatively, the icon disappears when I move the mouse cursor over the icon and is not available when I click the arrow to show hidden icons. The drive is not synchronising. 

I  am subscribed to the 100Gb Skydrive Storage plan and need to keep the files on Skydrive backed up. 

How do I resolve this issue?