Is klg.dat safe?

Please read below to decide for yourself whether the klg.dat 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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Klg.dat file information

The process known as Spyware Doctor Component or Spyware Doctor belongs to software Spyware Doctor or PC Tools Internet Security (version 2008) or Behavior Guard Add-on by PC Tools (

Description: Klg.dat is not essential for the Windows OS and causes relatively few problems. The file klg.dat is located in a subfolder of "C:\Program Files" or sometimes in a subfolder of the user's "Documents" folder. Known file sizes on Windows 10/8/7/XP are 100,864 bytes (44% of all occurrences), 99,328 bytes and 6 more variants. 
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. The service has no detailed description. It can change the behavior of other programs or manipulate other programs. The file is not a Windows core file. Klg.dat is able to record keyboard and mouse inputs. Therefore the technical security rating is 66% dangerous, however you should also read the user reviews.

Uninstalling this variant: In case of any problems with klg.dat, you can also do the following:
  • get help from the software vendor Pctools
  • check the vendor’s website for a newer version [1][2]
  • uninstall the software Spyware Doctor or PC Tools Internet Security using the Uninstall a Program function of Windows Control Panel (Windows: Start, Settings, Control Panel, Uninstall a Program)

Recommended: Identify klg.dat related errors

Important: Some malware camouflages itself as klg.dat, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the klg.dat 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

its spywaredoctors key logger protection if its in c:/program files/spydoctor if any where else delete it.
pc tools(spyware doctor) module -and clean
  secNET   (further information)
I get error 1934.users installations are disabled via policy on this machine
part of spyware doctor by name -- off the charts reading by STM, nod32 says it's clean
higly infectious version of smitfraud
  karl heiƟ  
closes down many apps such as VLC player. didn't happen before i installed Spyware Doctor
This file comes after installling the spydoctor
Part of the Spyware Doctor Anti-Spyware Program
More comments can be found here:
    (further information)

Rating chart

Summary: Average user rating of klg.dat: based on 29 votes with 9 reviews. 19 users think klg.dat is essential for Windows or an installed application. 3 users think it's probably harmless. 5 users think it's neither essential nor dangerous. One user suspects danger. One user thinks klg.dat is dangerous and recommends removing it. 3 users don't grade klg.dat ("not sure about it").

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Best practices for resolving klg issues

A clean and tidy computer is the key requirement for avoiding problems with klg. 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 klg.dat 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

klg.dat [all]