Hello, -Close the program. -C:\ Delete the Programdata\ideCAD10DEMO folder. (If you cannot see the ProgramData folder, it may be in the hidden location. You can make it visible by selecting the "Show hidden files and folders" option from the "Folder and Search options" section.) - On the left side of the keyboard, press and hold the Ctrl and Shift keys simultaneously -Run the program shortcut by double-clicking on the desktop. Do not release the Ctrl and Shift keys until the "Registry entry and settings have been cleared" warning appears on the screen. (The warning may also stay in the background) -Click OK on the warning that comes up. -Try again. Good work