npcap Can't install Npcap

Hey, I tried updating my npcap driver by running the newest installer. For some reason the installer fails right on start. I tried manually removing old parts of npcap, such as the service, driver file, dll files but had no success so far. When manually creating the Npcap folder inside ProgramFiles I was able to get the installer log.

Call: 726 Jump: 755 Jump: 758 detailprint: Windows CurrentVersion: 10.0 (Win10) Call: 62 Call: 1000 IfFileExists: file "C:\WINDOWS\system32\wpcap.dll" does not exist, jumping 194 IfFileExists: file "C:\npcap_install_options.txt" does not exist, jumping 199 Call: 200 Jump: 217 Jump: 234 Call: 238 Jump: 328 Call: 238 Call: 238 Call: 238 Call: 238 Call: 238 Call: 238 Call: 238 Call: 238 Call: 238 Call: 119 Call: 119 Jump: 517 Call: 1338 File: overwriteflag=0, allowskipfilesflag=2, name="C:\Users<User>\AppData\Local\Temp\nsv8B3B.tmp\modern-header.bmp" File: wrote 70976 to "C:\Users<User>\AppData\Local\Temp\nsv8B3B.tmp\modern-header.bmp" WriteINIStr: wrote [Field 1] State=0 in C:\Users<User>\AppData\Local\Temp\nsv8B3B.tmp\options.ini Jump: 533 WriteINIStr: wrote [Field 2] State=0 in C:\Users<User>\AppData\Local\Temp\nsv8B3B.tmp\options.ini Jump: 546 WriteINIStr: wrote [Field 3] State=0 in C:\Users<User>\AppData\Local\Temp\nsv8B3B.tmp\options.ini Jump: 559 WriteINIStr: wrote [Field 4] State=0 in C:\Users<User>\AppData\Local\Temp\nsv8B3B.tmp\options.ini Jump: 576 Call: 1338 File: overwriteflag=1, allowskipfilesflag=2, name="C:\Users<User>\AppData\Local\Temp\nsv8B3B.tmp\InstallOptions.dll" File: wrote 14848 to "C:\Users<User>\AppData\Local\Temp\nsv8B3B.tmp\InstallOptions.dll" Jump: 594 Jump: 599 Jump: 604 Jump: 610 New install of "Npcap 0.9983" to "C:\Program Files\Npcap" Section: "WinPcap" Call: 1079 Jump: 1094 detailprint: Stopping the npcap driver Call: 1338 File: overwriteflag=1, allowskipfilesflag=0, name="C:\Users<User>\AppData\Local\Temp\nsv8B3B.tmp\SimpleSC.dll" File: wrote 62976 to "C:\Users<User>\AppData\Local\Temp\nsv8B3B.tmp\SimpleSC.dll" Jump: 1166 settings logging to 0 logging set to 1 Jump: 1327 Aborting: "" Delete: DeleteFile("C:\Users<User>\AppData\Local\Temp\nsv8B3B.tmp\final.ini") Delete: DeleteFile("C:\Users<User>\AppData\Local\Temp\nsv8B3B.tmp\InstallOptions.dll") Delete: DeleteFile("C:\Users<User>\AppData\Local\Temp\nsv8B3B.tmp\modern-header.bmp") Delete: DeleteFile("C:\Users<User>\AppData\Local\Temp\nsv8B3B.tmp\nsExec.dll") Delete: DeleteFile("C:\Users<User>\AppData\Local\Temp\nsv8B3B.tmp\options.ini") Delete: DeleteFile("C:\Users<User>\AppData\Local\Temp\nsv8B3B.tmp\SimpleSC.dll") Delete: DeleteFile("C:\Users<User>\AppData\Local\Temp\nsv8B3B.tmp\System.dll") RMDir: RemoveDirectory("C:\Users<User>\AppData\Local\Temp\nsv8B3B.tmp")

Oct 17 '19 12:10 idoash4

The installer has found the previous installation's Uninstall registry key and is attempting to run the uninstaller. This fails, because you deleted the uninstaller, so the installation aborts. We can add some robustness for this situation, but your solution will have to be to further manually uninstall Npcap by editing the Registry (be careful, you may irreparably damage your system if you make other changes):

Open Registry editor: regedit.msc
Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall\
Delete the NpcapInst Registry key.

At this point, you should be able to run the Npcap installer, which ought to safely overwrite any remaining installation artifacts. I'm not entirely sure this will work for the npcap driver and service, though.

For future reference, when you encounter a problem with the installer, manually removing parts of the install will make it much harder for us to diagnose and help you.

Oct 23 '19 22:10 dmiller-nmap

Deleting the registry key solved my problem, thank you!

Oct 25 '19 12:10 idoash4

Thank you! This has been driving me insane for 3 weeks. Deleting the uninstall registry key solved my problem, too. The npcap service was successfully started after installation.

Oct 25 '19 15:10 EEaglehouse

Unable to install npcap in my system error occurring when installing setup file

Call: 452 Call: 1462 File: overwriteflag=1, allowskipfilesflag=0, name="C:\Users\GOPICH~1\AppData\Local\Temp\nsvE733.tmp\System.dll" File: skipped: "C:\Users\GOPICH~1\AppData\Local\Temp\nsvE733.tmp\System.dll" (overwriteflag=1) Call: 1462 File: overwriteflag=1, allowskipfilesflag=0, name="C:\Users\GOPICH~1\AppData\Local\Temp\nsvE733.tmp\System.dll" File: skipped: "C:\Users\GOPICH~1\AppData\Local\Temp\nsvE733.tmp\System.dll" (overwriteflag=1) Jump: 546 Call: 1462 File: overwriteflag=1, allowskipfilesflag=0, name="C:\Users\GOPICH~1\AppData\Local\Temp\nsvE733.tmp\System.dll" File: skipped: "C:\Users\GOPICH~1\AppData\Local\Temp\nsvE733.tmp\System.dll" (overwriteflag=1) Call: 1462 File: overwriteflag=1, allowskipfilesflag=0, name="C:\Users\GOPICH~1\AppData\Local\Temp\nsvE733.tmp\System.dll" File: skipped: "C:\Users\GOPICH~1\AppData\Local\Temp\nsvE733.tmp\System.dll" (overwriteflag=1) Jump: 593 Jump: 622 detailprint: Current date: 2020-06-21 10:12:57 Call: 1001 Jump: 1033 Jump: 1036 detailprint: Windows CurrentVersion: 10.0.18362 (Win10) Call: 62 Call: 1193 IfFileExists: file "C:\WINDOWS\system32\Packet.dll" exists, jumping 0 Call: 80 Jump: 103 Jump: 113 Call: 117 Jump: 184 Call: 117 WriteINIStr: wrote [Field 4] Text=Install Npcap in WinPcap API-compatible Mode (WinPcap will be uninstalled) in C:\Users\GOPICH~1\AppData\Local\Temp\nsvE733.tmp\options.ini Call: 197 Jump: 214 Jump: 231 Call: 235 Jump: 325 Call: 235 Call: 235 Call: 235 Call: 235 Call: 235 Call: 235 Call: 235 Call: 235 Call: 235 Call: 117 Call: 1462 File: overwriteflag=0, allowskipfilesflag=2, name="C:\Users\GOPICH~1\AppData\Local\Temp\nsvE733.tmp\modern-header.bmp" File: wrote 70976 to "C:\Users\GOPICH~1\AppData\Local\Temp\nsvE733.tmp\modern-header.bmp" Call: 452 Call: 1462 File: overwriteflag=1, allowskipfilesflag=0, name="C:\Users\GOPICH~1\AppData\Local\Temp\nsg5B0E.tmp\System.dll" File: skipped: "C:\Users\GOPICH~1\AppData\Local\Temp\nsg5B0E.tmp\System.dll" (overwriteflag=1) Call: 1462 File: overwriteflag=1, allowskipfilesflag=0, name="C:\Users\GOPICH~1\AppData\Local\Temp\nsg5B0E.tmp\System.dll" File: skipped: "C:\Users\GOPICH~1\AppData\Local\Temp\nsg5B0E.tmp\System.dll" (overwriteflag=1) Jump: 546 Call: 1462 File: overwriteflag=1, allowskipfilesflag=0, name="C:\Users\GOPICH~1\AppData\Local\Temp\nsg5B0E.tmp\System.dll" File: skipped: "C:\Users\GOPICH~1\AppData\Local\Temp\nsg5B0E.tmp\System.dll" (overwriteflag=1) Call: 1462 File: overwriteflag=1, allowskipfilesflag=0, name="C:\Users\GOPICH~1\AppData\Local\Temp\nsg5B0E.tmp\System.dll" File: skipped: "C:\Users\GOPICH~1\AppData\Local\Temp\nsg5B0E.tmp\System.dll" (overwriteflag=1) Jump: 593 Jump: 622 detailprint: Current date: 2020-06-21 10:19:59 Call: 1001 Jump: 1033 Jump: 1036 detailprint: Windows CurrentVersion: 10.0.18362 (Win10) Call: 62 Call: 1193 IfFileExists: file "C:\WINDOWS\system32\Packet.dll" exists, jumping 0 Call: 80 Jump: 103 Jump: 113 Call: 117 Jump: 184 Call: 117 WriteINIStr: wrote [Field 4] Text=Install Npcap in WinPcap API-compatible Mode (WinPcap will be uninstalled) in C:\Users\GOPICH~1\AppData\Local\Temp\nsg5B0E.tmp\options.ini Call: 197 Jump: 214 Jump: 231 Call: 235 Jump: 325 Call: 235 Call: 235 Call: 235 Call: 235 Call: 235 Call: 235 Call: 235 Call: 235 Call: 235 Call: 117 Call: 1462 File: overwriteflag=0, allowskipfilesflag=2, name="C:\Users\GOPICH~1\AppData\Local\Temp\nsg5B0E.tmp\modern-header.bmp" File: wrote 70976 to "C:\Users\GOPICH~1\AppData\Local\Temp\nsg5B0E.tmp\modern-header.bmp"

Jun 21 '20 05:06 GopiChandhan99

A popup window appears when running as administrator but closes automatically in 2-3 seconds

Jun 21 '20 05:06 GopiChandhan99

A popup window appears when running as administrator but closes automatically in 2-3 seconds

i have same problem here, how to solve it?

Mar 28 '21 11:03 weikang201

A popup window appears when running as administrator but closes automatically in 2-3 seconds

i have same problem here, how to solve it?

I also have this issue on windows 10, I tried installing different versions of npcap such as npcap 1,50, 0,999, 1,10 and all the installers seem to close automatically after 2-3 seconds without any error message. I also tried installing npcap from nmap but when npcap tried to installing the installer closed 2-3 seconds again without any error message. Any thoughts on this ?

Any help would be really appreciated, Thank you 😊😊

Sep 03 '21 02:09 IanAndersenNg