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npcap 0.993 uninstall not possible (results in blue screen) #357

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libertyx82 opened this issue Apr 28, 2019 · 11 comments
Closed

npcap 0.993 uninstall not possible (results in blue screen) #357

libertyx82 opened this issue Apr 28, 2019 · 11 comments

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@libertyx82
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@libertyx82 libertyx82 commented Apr 28, 2019

After i have installed npcap 0.993 on my windows (10 Build 17763.rs5 64bit) i can not uninstall npcap, the uninstall will result in an windows blue screen)

IRQL NOT LESS OR EQUAL

IMAG1330

@dmiller-nmap
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@dmiller-nmap dmiller-nmap commented Apr 29, 2019

Thanks for reporting this! We did not encounter this problem in testing. Can you please provide the crash dump that can be found in C:\Windows\Minidump\ or C:\Windows\MEMORY.DMP so that we can diagnose the bug? Thank you.

@dmiller-nmap
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@dmiller-nmap dmiller-nmap commented Apr 29, 2019

As a workaround, you can disable the Npcap driver service and then uninstall, which should prevent the blue screen:

  1. In an Administrator command window, run the command: sc.exe config npcap start= disabled
  2. Reboot the system.
  3. Uninstall Npcap.

@dmiller-nmap
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@dmiller-nmap dmiller-nmap commented Apr 29, 2019

I'm sorry, I incorrectly used the wrong issue number in that commit message. It is not related to this one.

@dmiller-nmap dmiller-nmap reopened this Apr 29, 2019
@libertyx82
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@libertyx82 libertyx82 commented Apr 30, 2019

Hi,
this Problem was caused by the AV Software i use (Avast), after i removed Avast the Problem no longer occurs.

So this is not an bug of npcap.

@sbaxevanis
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@sbaxevanis sbaxevanis commented Aug 10, 2019

Looks like Avast is the culprit - my experiences were identical and when I disabled the file and behavior options of Avast I was able to uninstall pcap.

@M1n1-Z
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@M1n1-Z M1n1-Z commented Sep 4, 2019

Avast was not the cause in my case. I was able to uninstall by executing uninstaller in silent mode:
C:\Program Files\NPcap\Uninstall.exe /S

@zdunning13
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@zdunning13 zdunning13 commented Sep 4, 2019

I have tried uninstalling silently, disabling the service from starting, and disabled Avast and I keep getting a blue screen when attempting to uninstall Npcap 0.955. I'm also getting a blue screen when rebooting my computer, an unplugging from my StarTech USB Dock.

@libertyx82
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@libertyx82 libertyx82 commented Sep 4, 2019

avast is only the Cause then the firewall module is installed, due to the reason that the firewall is causing this.
it is not sufficient to disable avast, avast or the firewall modul must be uninstalled to solve the Problem

@zdunning13
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@zdunning13 zdunning13 commented Sep 4, 2019

Uninstalling Avast and then uninstalling Npcap worked for my system. Thanks!

@M1n1-Z
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@M1n1-Z M1n1-Z commented Sep 5, 2019

I tried many things before. Maybe I did it from failsafe boot, and thus avast might not be running...

@Youda008
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@Youda008 Youda008 commented Sep 23, 2019

In fact, the error was on Npcap side in the end, it unloaded its driver module while Avast was still holding handle to it. nmap/nmap#1642
Easier than uninstalling Avast is to disable the npcap service and after reboot upgrade it to 0.996 or newer, as described here https://github.com/nmap/nmap/issues/1626#issuecomment-502393376

@fyodor fyodor transferred this issue from nmap/nmap May 5, 2021
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