Below is a list of steps you can take to prevent unwanted programs from opening on startup:

1. Disable Startup Programs:
   Go to the startup tab in the Task Manager and disable any unwanted programs that are set to autostart.
2. Third-party tool:
   There are many third-party tools available that help you manage programs that autostart.
3. Virus Scan:
   Run a virus scan to make sure that your system is clean of any malicious programs that might be causing the unwanted programs to startup.
4. Restore to Default Settings:
   If all else fails, you can restore your computer to its factory default settings. This will get rid of any unwanted programs that may have been installed.