Your forum profile says you are using SketchUp 8 and a SketchUp for Web (Free) license.
This cannot be correct. (The first is a desktop edition, the latter a “cloud” edition.
Are you using the browser-based SketchUp for Web, or one of the desktop editions ?
It does help if your profile says what version of the operating system you are running SketchUp on.
With regard to your grpahics subsystem, you must have one. See …