How to Fix Windows When Host Process Rundll32 Has Stopped Working

1. Update any Nero software on your system. Ensure that the software is the latest version and is compatible with Windows Vista and your computer hardware. Uninstall any Nero software if it is up to date and you still think it might be the cause of the error message; you can always reinstall the software if this does not fix the error.
2. Disable 'Data Execution Prevention.' Click the Windows logo, then select 'All Programs.' Highlight 'Accessories' and then click on 'Command Prompt.' Type the command 'bcdedit.exe /set {current} nx AlwaysOff' to disable DEP. Reboot the computer and see if the error returns.
3. Turn off the ability for Windows to display thumbnails in Windows Explorer. Open 'My Computer' and click on the 'Tools' menu. Choose 'Folder Options,' then pick the 'View' tab. Check the option that says 'Always show icons, never thumbnails.' Restart Windows and wait to see if the error is gone.
4. Right-click the speaker in the system tray. Choose 'Playback Devices' from the pop-up menu. Right-click one of the devices that appears in the window. Uncheck the option that reads 'Show Disabled Devices.'