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If you are referred to this post, we need more info to help you.
What version of the CAD are you using per Help | About?
What version of Windows are you running?
How much memory do you have?
What is the model of your computer?
What is the error message if any?
What menu steps led to an error?
Consider posting your current file per:
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"Quite easy to use. Within only about 10 minutes I had it downloaded, installed, and had designed and priced a brass cog with 32 teeth, 1 inch in diameter and 1/4 inch thick. The quote was immediate."