Assuming rebooting didn’t fix it, I’d try reinstalling RIS.
Yesterday when I tried to start Mindstorm RIS (RCX software) on a Windows XP system after reinstalling RIS to the PC, I got the following message on a "dialog box" -
"A critical error has occurred. You may be running out of memory, or you may need to reinstall Robotics Invention System 2.0"
Does anyone know how to resolve the problem?
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