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I had ADB working just a few days ago, but now, whenever I try to run adb.exe, it will start the daemon successfully, and then after a couple of commands the adb.exe file itself will disappear. When I try to uninstall then reinstall platform-tools via Android Studio's SDK manager immediately afterward, the uninstaller hangs (though the window doesn't freeze) after the following output:

To install: Preparing "Uninstall Android SDK Platform-Tools (revision: 27.0.1)". Generating patch... "Uninstall Android SDK Platform-Tools (revision: 27.0.1)" ready. Finishing "Uninstall Android SDK Platform-Tools (revision: 27.0.1)" Stopping ADB...

with the status:

Packing .installer/

However, I can't seem to find anything ADB-related in Task Manager. I tried killing it with adb kill-server, buy CMD's reply was of course that it couldn't find adb. After I restart Windows, the uninstallation/reinstallation runs perfectly well, but ADB just disappears all over again. What in the world is going on, and how do I get ABD up and running again?

Example CMD. When I reinstalled ADB after taking this screenshot and tried again, I didn't even get the * daemon started successfully message.

My CMD output

OS: Windows 10

Device: LG V30+ (United States/Sprint), Android 7.1.1, LGE USB driver

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    Sometimes Antivirus softwares block ADB, try disabling your AV software and try again. Or download Minimal ADB& Fastboot. – esQmo_ Jan 2 '18 at 2:41
  • Facepalm. Yep, that was it. I checked my quarantine folder and it was full of adb.exe's. Thanks. – Matthew Brown Jan 2 '18 at 2:43
  • You're welcome. I never understood why ADB os blocked by AV softwares. – esQmo_ Jan 2 '18 at 3:03
  • AV software often has more side-effects than good uses. Glad I don't need that snake-oil which only eats resources, throws false alerts, and makes things disappear :) – Izzy Jan 2 '18 at 9:06
  • Unless you are on Linux systems, AV is mandatory for Windows computers, or at least essential, as they are mainly targeted by malwares and viruses – esQmo_ Jan 4 '18 at 3:34
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As esQmo_ guessed in the comments on my question, my antivirus (Avast) was blocking adb.exe, probably with some silly "heuristic protection" feature. I checked my quarantine folder and found it chock full of adb.exe's. I whitelisted adb.exe and did not run into any more problems.

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That's all true. Disable Avast for Adv. exe but it seems to be a real threat because when trying to install the APK on a real device, the antivirus of the cell blocks it. If we unlock this option, we see strange behaviors in the Android system so I'm convinced that "Adv. exe " comes with bad intentions from a download server in Android Studio.

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