If some apps are not working on your Windows system, it could be due to various reasons like outdated software, corrupted files, or system conflicts. First, try restarting your computer and checking for updates. Ensure that your Windows OS and apps are up-to-date. If the issue persists, consider reinstalling the problematic apps. Running a system scan with built-in tools like Windows Defender or using the System File Checker can also help resolve the issue.