Rundll Error on Startup in Windows: How to Fix It

A RunDLL error usually means Windows is trying to load a DLL file that is missing, damaged, or left behind by removed software. The message often appears right after sign-in.

Common Causes

• An app was uninstalled but its startup task remained.
• Malware or adware left a broken DLL reference.
• A driver utility loads too early during startup.
• System files are damaged after an update or forced shutdown.

Fix RunDLL Startup Errors

1. Write down the DLL name shown in the error message.
2. Open Task Manager > Startup and disable suspicious or outdated entries.
3. Open Task Scheduler and check tasks from removed programs.
4. Run Windows Security or another trusted antivirus scan.
5. Open Command Prompt as administrator and run sfc /scannow.

Create a Backup Before Registry Cleanup

Some guides suggest deleting registry entries. Before doing that, create a backup so you can recover if the wrong startup item is removed.

• Free Download

Step 1. Open Qiling Backup and choose System Backup.

Step 2. Save the backup to an external drive.

Step 3. Review the backup task before editing startup or registry entries.

Step 4. Click Proceed. After the backup completes, continue with startup cleanup.

Conclusion

RunDLL startup errors are often leftover startup references. Disable the related entry, scan for malware, repair system files, and back up Windows before registry edits.

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