@Risk Error: "Method 'Initialize' of object '_RiskOL' failed"

This error can have several causes. Try @RISK after each step and stop when it works: Check Excel add-ins: Deactivate any other @RISK components (e.g., RISKOptimizer). Close Excel and retry. Verify system separators: In Excel Options → Advanced, ensure Use system separators is enabled. Excel 2013/2016 Start Screen: File → Options → General → uncheck Show the Start screen when this application starts. Restart Excel. Disable all non-Excel add-ins: If @RISK works, re-enable add-ins one by one to find conflicts (there may be multiple). If not, keep them disabled and continue. Remove outdated Office references using the registry cleanup procedure. Repair Office, then repair @RISK. If the issue persists, perform a clean uninstall and reinstall.