rundll32.exe - Analyze and How to Fix Errors

★★★★☆ Verified File (27.08.2026)

⚠️ Important Notice: Discover rundll32.exe: Microsoft's utility for executing functions in dynamic link libraries. Essential for system administrators and developers. Manually replacing system libraries can brick future Windows updates or cause critical system failures.

Architecture:	other	️ Not detected
Antivirus scan	✅ Clean	No viruses detected.
Digital signature	🟡 Not signed	Signature missing. The file may have been modified.
Hash Integrity	ℹ️ Unverified	File Hash protection is missing.
File size	8.7 kb.	8861 bytes.

Hashes:

MD5: 9fec8607781cbc761d32690d99f9bac4
SHA-1: 7d62b0146469157796ec249ef997e2e482c83310
SHA-256: 6d49a0f743ef674328360abe271425cf439cdc7119be8e7517a020a624c55f0c
SHA-512: 7b362f15aae37082334d421b7413641a90b8ea59a2ed90d6998c01adc68c401b676df4dc0f0b22d6f9f21ad39b2ae87fc3a64c471f3e2a4503e8975642478ad5

How to Fix Rundll32.exe Errors Without Downloading Third-Party Software

Rundll32.exe errors usually happen due to corrupted system files, incorrect registry paths, or malware masquerading as the file. You can fix this using built-in Windows tools.

1. Run SFC and DISM Scans

Windows has built-in tools to repair corrupted system files automatically.

Open the Start Menu.
Type cmd.
Right-click Command Prompt and select Run as administrator.
Type sfc /scannow and press Enter.
Wait for the scan to finish.
Next, type DISM /Online /Cleanup-Image /RestoreHealth and press Enter.
Restart your computer.

2. Check the File Location

Malware often mimics rundll32.exe. Ensure the real file is running.

Press Ctrl + Shift + Esc to open Task Manager.
Find Windows Host Process (Rundll32) under the Details tab.
Right-click it and select Open file location.
The correct path must be C:\Windows\System32.
If it is located anywhere else, run a full scan using Windows Defender.

3. Clear Browser History and Cache

Sometimes, temporary internet files trigger rundll32 errors.

Open your primary web browser.
Press Ctrl + Shift + Delete.
Select All time for the time range.
Check the boxes for Cache and Cookies.
Click Clear data.

4. Perform a Clean Boot

This helps identify if a third-party startup program is causing the conflict.

Press Win + R, type msconfig, and press Enter.
Go to the Services tab.
Check Hide all Microsoft services.
Click Disable all.
Go to the Startup tab and click Open Task Manager.
Disable all startup items.
Restart your PC.

5. Use System Restore

If the error started recently, revert your system back to a working state.

Press Win + S and type Create a restore point.
Click System Restore.
Choose a date before the error started appearing.
Follow the on-screen prompts and let Windows restart.

📊 Diagnostics Tool: Verify Your `rundll32.exe` File

Worried that the file on your PC has been modified by malware? Drop it into the form below. Our script will verify its file size, cryptographic hash (MD5/SHA-1), and check for a valid Microsoft digital signature.

Other versions:
️ rundll32.exe 10.0.19041.5794 32-bit (x86) | ️ rundll32.exe 10.0.19041.5794 64-bit (x64)
Similar files:
️rundll32.exe.mui