in Daemon Tools occurs when the application detects a problem verifying the digital signature of a file, driver, or module. This prevents the software from loading unsigned or tampered components, and is a security measure enforced by Windows driver-signing and code-signing policies.
: Windows may block DAEMON Tools drivers if it cannot authenticate their digital signature. This can happen due to recent hardware/software changes or corrupted driver files. Secure Boot Conflicts : In some cases, "Invalid Signature" errors are caused by Secure Boot
Restart your PC while holding the key to enter Advanced Startup.
Unlike a file corruption error or missing DLL, the Daemon Tools sign check error is actually a security feature , not a bug. It means the software successfully detected that its driver environment has been altered. Once you follow the clean reinstall and antivirus exclusion methods above, the software will trust its own components again.