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npcap 0.993 uninstall not possible (results in blue screen) #357
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)
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.
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.
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.
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
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
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dmiller-nmap commentedon 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\orC:\Windows\MEMORY.DMPso that we can diagnose the bug? Thank you.dmiller-nmap commentedon Apr 29, 2019
As a workaround, you can disable the Npcap driver service and then uninstall, which should prevent the blue screen:
sc.exe config npcap start= disableddmiller-nmap commentedon Apr 29, 2019
I'm sorry, I incorrectly used the wrong issue number in that commit message. It is not related to this one.
libertyx82 commentedon 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 commentedon 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 commentedon 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 /Szdunning13 commentedon 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 commentedon 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 commentedon Sep 4, 2019
Uninstalling Avast and then uninstalling Npcap worked for my system. Thanks!
M1n1-Z commentedon Sep 5, 2019
I tried many things before. Maybe I did it from failsafe boot, and thus avast might not be running...
Youda008 commentedon 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