What is TCAITDI?

The genuine TCAITDI.sys file is a software component of 3Com 3C2000x Network Interface Card by 3Com.
TCAITDI.sys is a device driver for the 3Com 3C2000x Network Interface Card. Device drivers allow hardware to communicate directly with the operating system and computer memory. 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.

TCAITDI stands for Three(3)Com Application Interface Transport Driver Interface

TCAITDI.sys is a Windows driver. A driver is a small software program that allows your computer to communicate with hardware or connected devices. This means that a driver has direct access to the internals of the operating system, hardware etc. The free file information forum can help you determine if TCAITDI.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for TCAITDI drivers in need of updating

TCAITDI.sys file information

The process known as 3Com Windows NT NIC Diagnostic TDI Driver belongs to software TCAITDI Protocol or 3Com Windows NT NIC Diagnostic TDI Driver by 3Com (

Description: TCAITDI.sys is not essential for the Windows OS and causes relatively few problems. TCAITDI.sys is located in the C:\Windows\System32\drivers folder. The file size on Windows 10/8/7/XP is 19,534 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program has no visible window. TCAITDI.sys is not a Windows core file. TCAITDI.sys appears to be a compressed file. Therefore the technical security rating is 27% dangerous.

Recommended: Identify TCAITDI.sys related errors

Important: Some malware disguises itself as TCAITDI.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the TCAITDI.sys 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.


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Best practices for resolving TCAITDI issues

A clean and tidy computer is the key requirement for avoiding problems with TCAITDI. 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 TCAITDI.sys 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

TCAITDI.sys [all]