What is atdialler1.exe?

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 atdialler1.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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Atdialler1.exe file information

The process known as Micro Dialler for Wanadoo or Micro Dialler for Freeserve belongs to software Wanadoo Connection Kit or Freeserve Connection Kit by Wanadoo ( or Hewlett Packard (

Description: Atdialler1.exe is not essential for the Windows OS and causes relatively few problems. The file atdialler1.exe is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 192,512 bytes (66% of all occurrences) or 155,648 bytes. 
There is an icon for this program on the taskbar next to the clock. It can change the behavior of other programs or manipulate other programs. The file is not a Windows system file. Therefore the technical security rating is 45% dangerous; however you should also read the user reviews.

Uninstalling this variant: You have the option to uninstall Wanadoo Connection Kit or Freeserve Connection Kit software via Windows Control Panel/Add or Remove Programs (Windows XP) or Programs and Features (Windows 10/8/7).

Recommended: Identify atdialler1.exe related errors

External information from Paul Collins:

Important: Some malware camouflages itself as atdialler1.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the atdialler1.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

This Process is not needed but if you cannot connect then it uses the atdialler1.exe to execute another number for you to dial automatically (Free phone number)
  Gary   (further information)
Not dangerous at all. If you are on dial-up, this simply attempts to connect you to different Wanadoo numbers if the first one fails.
  Risker   (further information)

Summary: Average user rating of atdialler1.exe: based on 2 votes with 2 user comments. 2 users think atdialler1.exe is essential for Windows or an installed application.

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Best practices for resolving atdialler1 issues

A clean and tidy computer is the key requirement for avoiding problems with atdialler1. 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 atdialler1.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

atdialler1.exe [all]