ci.dll - Analyze and How to Fix Errors

★★★★☆ Verified File (27.08.2026)

⚠️ Important Notice: Troubleshoot CI DLL errors and optimize Windows performance with our guide. 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	62.4 kb.	63927 bytes.

Hashes:

MD5: f5fd3f8186cd66a924a525436947dfec
SHA-1: cf7ed5b57077b4922ff130009dc5298a3d9f1b45
SHA-256: 712b971ff4875191b43c1de5c8581b363e6de5db1ced033186a3f05d92e81c2f
SHA-512: d4fc9cecbdc2d00a14a3e5a26887d7c9be0224fd8e25217e923ad2f5c46940e42040d54ff14b96d5fffaf430aeccc1fcb8e79be31a0c08fafd1e9ebfb3663e6e

To fix a ci.dll (Code Integrity) error without downloading external files, you must repair your existing system files. Downloading DLL files from third-party sites is dangerous and unnecessary.

Here is how to safely fix the error using built-in Windows tools.

1. Run SFC and DISM Tools

Windows has built-in repair tools that check for corrupted system files and replace them automatically.

Press the Windows Key.
Type cmd.
Right-click Command Prompt and choose Run as administrator.
Type sfc /scannow and press Enter.
Wait for the scan to finish.
Type DISM /Online /Cleanup-Image /RestoreHealth and press Enter.
Restart your computer.

2. Register the DLL File

If the file exists but Windows cannot read it, you can re-register it via the command line.

Open Command Prompt as an administrator.
Type regsvr32 c:\windows\system32\ci.dll and press Enter.
Restart your PC.

3. Check for Windows Updates

Microsoft frequently releases patches for corrupted system files like ci.dll.

Press Windows Key + I to open Settings.
Click Update & Security (or Windows Update on Windows 11).
Click Check for updates.
Install all pending updates and restart your device.

4. Use System Restore

If the error started recently, you can roll back your system to a time when it worked perfectly.

Press the Windows Key.
Type Create a restore point and click the top result.
Click the System Restore button.
Choose a date/time before the error started.
Follow the prompts and let Windows restore itself.

5. Boot into Safe Mode

If the error prevents Windows from booting normally, use Safe Mode to run the steps above.

Hold the Shift key while clicking Restart in the Start Menu.
Go to Troubleshoot > Advanced options > Startup Settings.
Click Restart.
Press 4 or F4 to enable Safe Mode.
Run the SFC and DISM commands listed in Step 1.

📊 Diagnostics Tool: Verify Your `ci.dll` 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.