当安装了硬件或软件但没有附带数字签名文件时，它会引起对任何防病毒软件^(Antivirus)和Windows本身的怀疑。众所周知， Windows Security^{(Windows Security)}（又名Windows Defender ）在这种情况下无法验证数字签名时会引发错误 577 。^{(Error 577)}这篇文章将帮助您解决问题。

Windows 无法启动Windows Defender 服务^{(Windows Defender Service)}

完整的错误信息如下：

Windows could not start Windows Defender Service.

Error 577: Windows cannot verify the digital signature for this file. A recent hardware or software change might have installed a file that was signed incorrectly or damaged, or that might be malicious software from an unknown source.

Windows Defender 错误 577^{(Defender Error 577)}，无法验证数字签名

当您打开Windows Defender时，通常会发生该错误，这就是与现有软件发生冲突的时候。这不仅仅是任何软件，而是可能导致问题的安全软件。

1]检查残留软件

如果您安装了新的防病毒软件^(Antivirus)或最近卸载了某个软件，则可能是它留下了一些文件，并且卸载不完整。您将不得不手动查找文件或找到卸载程序以将其删除。如果是安全软件，请使用这些AntiVirus Removal Tools。如果不在列表中，您可以尝试使用免费的卸载软件^{(free uninstaller software)}来删除残留文件。

2]检查Webroot卸载

如果您使用过Webroot，它可能没有完全正确地卸载。使用Webroot 中的这个工具^{(tool from Webroot)}来完成卸载，看看它是否有帮助。

3]打开Windows Defender

当您无法打开 Windows Defender^{(cannot turn on Windows Defender.)}时，我们有一篇详尽的文章介绍了您可以遵循的不同方式。如果您对注册表^(Registry)感到满意，请按照以下步骤打开Windows Defender。

按 Win^{(Press Win)}键 + R 打开运行^(Run)提示。

键入“^{(Type “)} regedit”并按Enter键

导航到这些键：

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender

将“ DisableAntiSpyware ”和“ DisableAntiVirus ”的值从“0”更改为“ 1 ”。

如果不存在，您可以创建具有相同名称的 DWORD并更改值。

尝试重新运行Windows Defender，它应该可以工作。

我希望这篇文章很容易理解，并且您能够打开Windows Defender并解决错误 577^{(Error 577)}问题。虽然最后一种方法效果很好，但请注意，您需要摆脱任何试用版的安全软件或剩余的注册表和文件才能最终解决它。

Windows Defender Error 577, Cannot verify the digital signature

When a hardware or software is installed and does not come with a digitallу signed filе, it raises a suspicion of any Antivirus and Windоws itself. Windows Security, aka Windows Defender, has been known to throw Error 577 when it cannot verify the digital signature in such a situation. This post will help you resolve the problem.

Windows could not start Windows Defender Service

The full error message is as follows:

Windows could not start Windows Defender Service.

Error 577: Windows cannot verify the digital signature for this file. A recent hardware or software change might have installed a file that was signed incorrectly or damaged, or that might be malicious software from an unknown source.

Windows Defender Error 577, Cannot verify the digital signature

The error usually occurs when you turn on Windows Defender, and that’s when the conflict happens with existing software. It’s not just any software, but security software that may be causing the problem.

1] Check for Residual Software

If you had installed a new Antivirus or recently uninstalled a software, then it is possible that it has left some files behind, and the uninstallation is incomplete. You will have to manually look around for files or locate an uninstaller for the program to delete it. If it is security software, then use these AntiVirus Removal Tools. If it is not on the list, you can try a free uninstaller software to delete residual files.

2] Check Webroot uninstallation

If you have used Webroot, it may not have uninstalled fully and properly. Use this tool from Webroot to complete the uninstallation and see if it helps.

3] Turn on Windows Defender

We have an exhaustive post on different ways you can follow when you cannot turn on Windows Defender. If you are comfortable with Registry, then follow these steps to turn on Windows Defender.

Press Win key + R to open Run prompt.

Type “regedit” and press the Enter key

Navigate to these keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender

Change value of ‘DisableAntiSpyware‘ and ‘DisableAntiVirus‘ from ‘0’ to ‘1‘.

If it is not there, you can create the DWORD with the same names and change the value.

Try re-running the Windows Defender, and it should work.

I hope the post was easy to follow, and you were able to turn on the Windows Defender and resolve the Error 577 problem. While the last method works fine, be aware that you need to get rid of any trial version of security software or leftover registry and files to resolve it finally.

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