Thanks for responding.
I tried and still the same happended, I unisntalled Sketchup hoping to re-install it with my licence # but seems the only way is through the purchasing process, Obviously I do not want to get charged twice. I've downloadad Sketchup 6 free and seems to be working fine. Do you know how can I download Sketchup 7pro with my licence #?
How can I find what video card is in my laptop?

@remus said:

As a diagnostic measure, try going window->preferences->openGL and turning off 'hardware acceleration' and 'fast feedback'.

If that works: what graphics card are you using and have you got the latest drivers for it?

Tnaks for replying, I tried your suggestion and still same problem. Sketchup is installed in laptop and drivers are up to date, so I uninstalled the software, now I can't find Sketchup 7 pro on line without going through the purchasing process again. Since I already bought it, I do not want to get charged again. More suggestions?

Hello, yesterday I downloaded the free Sketchup 7 for Windows Vista and drew some shapes, but when I activated it with the licence number after purchasing it, I could not draw anyting anymore. The drawing screen is totally white or totally black with no horizon line, and no lines nor shapes can be drawn. Any suggestions?