What is TCAUDIAG.exe?

The genuine TCAUDIAG.exe file is a software component of 3Com 3C2000x Network Interface Card by 3Com.
TCAUDIAG.exe is an executable file that belongs to the 3Com 3C2000x Network Interface Card. This is not a critical Windows component and should be removed if known to cause problems. 3Com Corporation was an American company that manufactured digital electronics. The company was founded by Robert Metcalfe (the co-inventor of the Ethernet) with Howard Charney, Bruce Borden, and Greg Shaw, in 1979. 3Com was based in Massachusetts, USA. In 2010, 3Com was acquired by Hewlett-Packard.

TCAuDiag stands for Three(3)Com Automated Installation/Diagnostic Microsoft Foundation Class (MFC) application

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the TCAUDIAG.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

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TCAUDIAG.exe file information

The process known as TouchDown MFC Application belongs to software TouchDown Application by 3Com (

Description: TCAUDIAG.exe is not essential for the Windows OS and causes relatively few problems. The TCAUDIAG.exe file is located in the C:\Windows\System32 folder. Known file sizes on Windows 10/8/7/XP are 1,323,008 bytes (57% of all occurrences) or 1,334,784 bytes. 
The file is not a Windows core file. The program starts upon Windows startup (see Registry key: MACHINE\Run). There is no information about the author of the file. TCAUDIAG.exe is located in the Windows folder, but it is not a Windows core file. The program has no visible window. TCAUDIAG.exe is able to record keyboard and mouse inputs. Therefore the technical security rating is 50% dangerous, however you should also read the user reviews.

Recommended: Identify TCAUDIAG.exe related errors

External information from Paul Collins:
There are different files with the same name:

Important: Some malware disguises itself as TCAUDIAG.exe, particularly when not located in the C:\Windows\System32 folder. Therefore, you should check the TCAUDIAG.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

3Com Network Diag? Not 100% what it does
3Com NIC Installation/Diagnostic MFC application.
  Bob Seiberling  
Part of the 3COM drivers
  m4k   (further information)
It comes with 3Com NIC Doctor for 3c905 Ethernet NIC
  Spider   (further information)
3Com Lan Monitor
it is part of the 3dcom diagnostics that com with the gigabit eth0 devices on many mobos, harmless, but if your networks running fine it is not needed, so rem it from mem but dont quar.

Rating chart

Summary: Average user rating of TCAUDIAG.exe: based on 7 votes with 6 user comments. 6 users think TCAUDIAG.exe is essential for Windows or an installed application. One user thinks it's neither essential nor dangerous.

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Best practices for resolving TCAUDIAG issues

A clean and tidy computer is the key requirement for avoiding problems with TCAUDIAG. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the TCAUDIAG.exe process on your computer, the following programs have proven to be helpful: Security Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

TCAUDIAG.exe [all]