When I was a network support engineer, we had a case where a company had a bizarre & intermittent problem on workstations. Wish I could remember what the problem was but this is 20+ years ago now.
To troubleshoot it, we installed Microsoft Network Monitor 2.0 (this was well before Wireshark...) on a few workstations. NM2 installed a packet capture driver and a GUID front-end. And...the problem went away.
Our best guess was that the problem was some sort of race condition and installing the packet capture driver was enough to change the timing and make the problem go away. The customer didn't want to spend more time on it so they installed NM2 everywhere and closed the case.
I occasionally imagine somebody trying to figure out why they're still installing the NM2 driver everywhere.
