What is tpnumlkd.dll?

The genuine tpnumlkd.dll file is a software component of On screen display by Lenovo Group.
In Lenovo's ThinkPad line of notebook computers, "tpnumlkd.dll" is part of the Microsoft Windows operating system. The filename refers to many versions of a dynamic link library occurring across Windows XP, 7, 8, and Vista, as well as older versions like NT, 2000, Millennium, 95, or 98. Errors with this module are said to be frequent in all of these versions and can result from obsolete registry entries or damage to the file during installation or removal of programs. (Installation of incompatible programs may cause this.) When this module fails it can affect registry entries for "corefoundation.dll" and, in turn, invalid entries for that module can cause the "tpnumlkd.dll" error. Simply reloading corefoundation.dll can help end the DLL error itself, but a registry cleaner program is recommended to remove the invalid entries or the system may remain unstable.

TPNumLkD stands for ThinkPad NumericLock for OnScreen Display

Tpnumlkd.dll is a Windows DLL file. DLL is the abbreviation for Dynamic Link Library. DLL files are needed by programs or web browser extensions, because they contain program code, data, and resources. The following information can help you determine if tpnumlkd.dll is a Windows system file or if it belongs to an application that you can trust.

Click to Run a Free Scan for tpnumlkd.dll related errors

Tpnumlkd.dll file information

The process known as NumLock on screen display for ThinkPad belongs to software On screen display or Anzeige am Bildschirm by Lenovo Group (

Description: Tpnumlkd.dll is not essential for the Windows OS and causes relatively few problems. Tpnumlkd.dll is located in a subfolder of "C:\Program Files". The file size on Windows 10/8/7/XP is 34,080 bytes. 
A .dll file (Dynamic Link Library) is a special type of Windows program containing functions that other programs can call. This .dll file can be injected to all running processes and can change or manipulate their behavior. The program is not visible. It is a Verisign signed file. It is certified by a trustworthy company. There is no detailed description of this service. The file is able to record keyboard inputs. Tpnumlkd.dll is not a Windows core file. Tpnumlkd.dll is able to record keyboard and mouse inputs. tpnumlkd.dll appears to be a compressed file. Therefore the technical security rating is 72% dangerous; however you should also read the user reviews.

Uninstalling this variant: If you have any problems with tpnumlkd.dll, you may want to remove the entire program On Screen Display or Anzeige am Bildschirm using Windows Control Panel.

Recommended: Identify tpnumlkd.dll related errors

Important: Some malware camouflages itself as tpnumlkd.dll. Therefore, you should check the tpnumlkd.dll 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

This is software for the Lenovo Thinkpad

Summary: Average user rating of tpnumlkd.dll: based on 1 vote with 1 user comment. One user thinks it's probably harmless.

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Best practices for resolving tpnumlkd issues

A clean and tidy computer is the key requirement for avoiding problems with tpnumlkd. 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 tpnumlkd.dll 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

tpnumlkd.dll [all]