Velvet installation problem after download

Hello, after installing Velvet on my computer. when i click-on on the velvet button on my desktop in order to run the program, the program doesn't start and asked me everytime about repair or uninstall. When i run setup, at the end of the setup progress everything's looked OK and i get the message "setup successful", but each time i try to run Velvet, the setup box asked me to repair or uninstall.
What can i do ?
Thank you for your help.
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