Since 64.dll is often application-specific, the most reliable fix is to reinstall the software that is throwing the error.

If your error was caused by a damaged Windows component, this online fix will resolve the 64.dll error without any third-party downloads.

If you have decided to trust the file and it isn't working, try these steps:

If using a launcher, use the "Verify Integrity" tool, though this usually only works for official files and may overwrite the fix. System File Checker: Run the command sfc /scannow

Here are some methods to fix 64.dll errors: