Your device is at risk because it’s out of date and missing important security and quality updates. Let’s get you back on track so Windows can run more securely. Select this button to get going:

After trying many of the suggestions above, this finally worked for me:

a (more generic) mod to the MS forum answer](https://answers.microsoft.com/en-us/windows/forum/windows_10-update/your-device-is-at-risk-because-its-out-of-date-and/8be130eb-493a-4f03-b655-2a4a5de42cfe?auth=1) from user [R. Anthony (Thanks, Anthony!):

**1.**Search the Microsoft®Update Catalog for latest available updates for your OS version, e.g. search "windows 10 version 1709 for x64" 

Download the latest updates including the latest available CUMULATIVE update (just in case) - e.g.

2018-11 Cumulative Update for Windows 10 Version 1709 for x64-based Systems (KB4467681)

2018-12 Update for Windows 10 Version 1709 for x64-based Systems (KB4477136)

2018-12 Update for Windows 10 Version 1709 for x64-based Systems (KB4483530)

Save those in a SEPARATE folder (e.g. WinUpdTemp)

2. Open Control Panel → Programs and Features → View Installed Updates

→ Search for the KB for the latest cumulative update (e.g. KB4467681) - s/b under "Quality Updates"

→ if it is there (ie. "Successfully installed", NOT "Failed"), uninstall it

**3.**Reboot 

*NOTE* after the reboot DO NOT go check for updates again, as the machine will realize KBxxx is not there and put it right back.

4. Go to the folder  (e.g. WinUpdTemp) created in step 1. above and click on the latest KBxxx cumulative update and install. → re-boot as prompted.

5. Repeat the manual installation for any additional updates newer than the last available cumulative update, and re-boot if prompted.

6. Only after the final reboot check for updates.

Your error should be gone.

lỗi win

Check that "Windows Modules Installer" Service hasn't been disabled. That can be the cause of the infinite loop of saying that "Your device is at risk".

I awakened today to this problem, after having shut down my Windows 10 v1709 PC last night (2018-08-11) without problems. I attempted the usual fixes: (1) running the Windows Update troubleshooter [both from Settings and the stand-alone troubleshooter], (2) manually stopping and restarting the usual services related to Windows Update (Windows Update, BITS, Windows Installer, etc...), (3) manually deleting the contents of the c:\Windows\SoftwareDistribution\Download folder, (4) uninstalling the most recent Windows Update [KB4295110, installed on 2018-08-10], and finally (5) ) re-installing that most recent Windows Update [KB4295110], which curiously DID successfully install, but was followed thereafter by the same red  "Your device is at risk..." error message.

I then installed the most recent Windows 10 cumulative update applicable to my system from the Microsoft Update Catalog web site, after searching for the term "Windows 10 cumulative update",  in my case:

2018-07 Cumulative Update for Windows 10 Version 1709 for x64-based Systems (KB4338817) dated 7/23/2018

(840.9 MB)

from this page:

https://www.catalog.update.microsoft.com/Search.aspx?q=windows%2010%20cumulative%20update

file name:  windows10.0-kb4338817-x64_8e9a3f093879f88d1e9c22d1b133d38fa44a3ede.msu

It took a LONG time to install this update, followed by the usual lengthy shut-down and re-start process, but now the red "Your device is at risk..." error message does not appear, and so far it looks like Windows Update checking is working properly again.

No, the troubleshooter did not resolve the Windows Update issue; The Windows Update still doesn't work.