What is slserv.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 slserv.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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Slserv.exe file information

Windows Task Manager with slserv
Slserv.exe process in Windows Task Manager

The process known as User-Level Modem Service belongs to software Modem or Soft Modem or SmartLinkService by Smart Link (

Description: Slserv.exe is an important part of Windows, but often causes problems. Slserv.exe is located in the C:\Windows\System32 folder. Known file sizes on Windows 10/8/7/XP are 45,056 bytes (46% of all occurrences), 73,796 bytes, 57,344 bytes, 65,536 bytes or 94,276 bytes. 
There is no description of the program. The program is not visible. The slserv.exe file is a Microsoft signed file. Therefore the technical security rating is 27% dangerous; however you should also read the user reviews.

Recommended: Identify slserv.exe related errors

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

Driver for the SmartLink modem. Disable if you don't use your modem any longer, just remember to turn it on if you ever want to connect to the Internet over dial-up in some 3rd world country. If your computer doesn't have a modem then it is probably a virus
damn..its use to much cpu usage and make ma cpu slow down..
Definitely installed when the Smartlink modem is installed. Uses 284K private bytes, 944K working size. Can be set to not load with msconfig or autoruns. harmless IF no trojan dialers on the system.
visit travelocity
  on line travelocity   (further information)
virtual craps
  craps rule  
It appears to enable the modem to self dial, when an item of malware enters the system it can access this to connect and complete. Ending process after load-up does not have any adverse effects.
  Bruce F  
I have this file in system32 and when I delete it after 3-4 seconds of pc activity it "magically" reappears.I think it is part of a dialler hijack trojan or worm, which I had and successfully removed some of the files so it does not cause any actual harm to me,but I dearly like to defeat the remaining parts.
  Ray Buxton  
hard money
  hard money   (further information)
More comments can be found here:
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Rating chart

Summary: Average user rating of slserv.exe: based on 24 votes with 9 reviews. 11 users think slserv.exe is essential for Windows or an installed application. 4 users think it's probably harmless. 2 users think it's neither essential nor dangerous. 2 users suspect danger. 5 users think slserv.exe is dangerous and recommend removing it. 4 users don't grade slserv.exe ("not sure about it").

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Best practices for resolving slserv issues

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

slserv.exe [all]