@tig said:

You double posted ! So I deleted one of them.
As a new poster please have patience - there are systems in place to prevent spamming that might slow your progress down the first few times, until the system believes you are genuine/human...

Also I am moving this thread to the SketchyPhysics Forum where it will receive better coverage/responses...

Thanks and sorry for posting twice

@unknownuser said:

I haven't heard of that one before, what SketchPhysics version are you running?

Try deleting the SketchPhysics files from your Sketchup/Plugins folder and try installig it again, preferably version 3.2
http://code.google.com/p/sketchyphysics/downloads/list

I removed all even SketchUp. I have downloaded the latest version of SketchUp and SketchyPhysics but the problem has not fixed.
I have other computer running in Windows7 and works perfectly but not in mine with XP.