Isdone.dll Error Unarc.dll Error-12 Does Not Match Checksum Fix Jun 2026

The System File Checker (SFC) scan can help find and replace damaged system files.

Go to Settings > Update & Security > Windows Update Scan for any pending updates and install them isdone.dll error unarc.dll error-12 does not match checksum

Open Command Prompt as root Type the listed commands and push Enter after each: regsvr32 /s isdone.dll regsvr32 /s unarc.dll Step 5: Run a System File Checker (SFC) Scan The System File Checker (SFC) scan can help

Start Command Prompt as administrator Enter the below command and hit Enter: sfc /scannow Step 6: Disable Antivirus Software isdone.dll error unarc.dll error-12 does not match checksum