What is LavasoftTcpService.dll?

The genuine LavasoftTcpService.dll file is a software component of Web Companion by Lavasoft.
"LavasoftTCPService.dll" contains additional executable code used by the Lavasoft TCP Service whose main executable starts when Windows starts and always runs. On 64-bit machines, a second 64-bit library named "LavasoftTCPService64.dll" in "C:\Windows\System32" complements this 32-bit library in "C:\Windows\SysWoW64". The TCP Service enables Lavasoft's Web Companion to detect what URLs the browser is submitting by intercepting requests in the Transmission Control Protocol stack level and submitting these to cloud-based Malicious URL (MURL) detection. Uninstalling WebCompanion often leaves the DLL behind which keeps some other companies' software from running. Consult Lavasoft Support for this problem. Lavasoft pioneered anti-spyware commercial applications in 1999 when "spyware" was a new term and they continue to lead the field, committed to make millions of users' PC's and the Internet safer through their free anti-malware program and partnering with other security providers to keep up with over half a million new threats and variants created daily.

LavasoftTCPService stands for Lavasoft TCP Intercept Service

LavasoftTcpService.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 LavasoftTcpService.dll is a Windows system file or if it belongs to an application that you can trust.

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LavasoftTcpService.dll file information

The process belongs to software LavasoftTcpService.exe or Lavasoft Software Canada by Lavasoft (

Description: LavasoftTcpService.dll is not essential for Windows and will often cause problems. The LavasoftTcpService.dll file is located in the C:\Windows\System32 folder. Known file sizes on Windows 10/8/7/XP are 345,360 bytes (78% of all occurrences), 342,016 bytes and 10 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. There is no file information. The program is not visible. LavasoftTcpService.dll is not a Windows core file. It can change the behavior of other programs or manipulate other programs. The service has no detailed description. The LavasoftTcpService.dll file is a Verisign signed file. LavasoftTcpService.dll is able to monitor applications. Therefore the technical security rating is 69% dangerous, however you should also read the user reviews.

Uninstalling this variant: If you run into problems with LavasoftTcpService.dll, you can do the following:
  1) uninstall the software LavasoftTcpService or Lavasoft Software Canada using the Uninstall a Program function of Windows Control Panel (Windows: Start, Settings, Control Panel, Uninstall a Program)
  2) ask the developer,, [1][2] for support.

Recommended: Identify LavasoftTcpService.dll related errors

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

If I disable the file I lose access to the network because Windows XP Pro can't acquire an IP#. Repair doesn't work

Summary: Average user rating of LavasoftTcpService.dll: based on 2 votes with 1 user comment. One user thinks it's probably harmless. One user thinks LavasoftTcpService.dll is dangerous and recommends removing it. One user is not sure about it.

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Best practices for resolving LavasoftTcpService issues

A clean and tidy computer is the key requirement for avoiding problems with LavasoftTcpService. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic 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 6resmon 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 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the LavasoftTcpService.dll process on your computer, the following programs have proven to be helpful: ASecurity 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. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

LavasoftTcpService.dll [all]