How to fix error error-invalid-signal-number in Windows 11

Solution Steps

1. 1 First, try updating the program that's causing the error. Check the software vendor's website for the latest version. Outdated software might use signal numbers that are no longer valid in Windows 11.
2. 2 Run Windows Update: Press Windows key + I to open Settings, go to Windows Update, and click 'Check for updates'. Install all pending updates, as they often include compatibility fixes.
3. 3 Run System File Checker: Press Windows key + R, type 'cmd', then press Ctrl + Shift + Enter to open Command Prompt as administrator. Type 'sfc /scannow' and press Enter. This repairs corrupted system files that might be causing the error.
4. 4 If the error persists, run DISM: In the same Command Prompt, type 'DISM /Online /Cleanup-Image /RestoreHealth' and press Enter. This fixes the Windows system image.
5. 5 Check for driver updates: Press Windows key + X and select 'Device Manager'. Right-click each device and select 'Update driver'. Choose 'Search automatically for drivers'. Incompatible drivers can cause signal errors.
6. 6 If the error occurs in a specific application, try running it in compatibility mode: Right-click the program's shortcut, select 'Properties', go to the 'Compatibility' tab, and check 'Run this program in compatibility mode for' and select a previous Windows version. Click OK and try running it again.