System File Checker (SFC) by Microsoft

System File Checker (SFC) is a built-in tool by Microsoft Windows, used to scan and repair corrupted or missing system files, including .dll files.

You must open the Command Prompt (cmd) as an Administrator to use this feature.

Open the Command Prompt

Windows Command Tool (CMD)

Scan only

C:\User\Username>sfc /verifyonly

Scan and fix errors

C:\User\Username>sfc /scannow

Purge cache and scan integrity

C:\User\Username>sfc /purgecache

Revert SFC changes

C:\User\Username>sfc /revert
Did you know...

Not all .dll errors stem from missing files. They can also result from version mismatches, file corruption, or software incompatibility.