I've seen a similar report.
It emanates from the way it was installed initially.
Try uninstalling, then freshly reinstalling v2015.
This time do NOT double-click the icon for the installer's exe file - even if you have 'admin-powers' - instead you should select its icon > context-menu > 'Run as Admin...'
That way it's installed proeprly.
Another thing to do is after it's installed find the SketchUp.exe file in the Program Files, SketchUp folder and context-menu > Compatibility > 'Always run this program as an administrator' should always be ticked [you'll need 'admin-powers' to do that]
PS: Please update your User Info to suit the version you end up using... 😄