Hang in there, I use windows 7 and sketchup with no problems. Take a look at this from sketchup support:
SketchUp relies on OpenGL 1.5 compliant graphics card and drivers. Please be aware that there may be several graphics cards that don't have Windows Vista/Windows 7 compatible drivers yet. This is why it's important to continually check with the graphics card manufacturer for new drivers.
I hope this helps.