Build Information:
(This from the previous working version of Wireshark/Npcap)...

Version 3.2.2 (v3.2.2-0-ga3efece3d640)
Copyright 1998-2020 Gerald Combs gerald@wireshark.org and contributors. License GPLv2+: GNU GPL version 2 or later https://www.gnu.org/licenses/gpl-2.0.html This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Compiled (64-bit) with Qt 5.12.6, with WinPcap SDK (WpdPack) 4.1.2, with GLib 2.52.3, with zlib 1.2.11, with SMI 0.4.8, with c-ares 1.15.0, with Lua 5.2.4, with GnuTLS 3.6.3 and PKCS #11 support, with Gcrypt 1.8.3, with MIT Kerberos, with MaxMind DB resolver, with nghttp2 1.39.2, with brotli, with LZ4, with Zstandard, with Snappy, with libxml2 2.9.9, with QtMultimedia, with automatic updates using WinSparkle 0.5.7, with AirPcap, with SpeexDSP (using bundled resampler), with SBC, with SpanDSP, with bcg729.
Running on 64-bit Windows 7 Service Pack 1, build 7601, with Intel(R) Core(TM) i7-3820 CPU @ 3.60GHz (with SSE4.2), with 16336 MB of physical memory, with locale English_United Kingdom.1252, with light display mode, without HiDPI, with Npcap version 0.9986, based on libpcap version 1.9.1, with GnuTLS 3.6.3, with Gcrypt 1.8.3, with brotli 1.0.2, without AirPcap, binary plugins supported (19 loaded). Built using Microsoft Visual Studio 2019 (VC++ 14.24, build 28316).
Wireshark is Open Source Software released under the GNU General Public License.

The latest version of Npcap (0.9987(?) bundled with Wireshark Vn 3.2.3) causes a General Failure on my NIC card (Intel 82579V Gigabit Network Connection, Driver 11.13.51.0 built by WinDDK).

Uninstalling Npcap or reverting to this previous version (64-bit Wireshark Vn 3.2.2, Npcap Vn 0.9986) gives me a functioning NIC card - hence I can post this bug report.