What is PropelAC.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 PropelAC.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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PropelAC.exe file information

The process known as Propel Accelerator belongs to software BellSouth Accelerator or Propel Accelerator by Propel Software (

Description: PropelAC.exe is not essential for Windows and will often cause problems. The PropelAC.exe file is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 918,331 bytes (50% of all occurrences) or 1,007,598 bytes. 
There is an icon for this program on the taskbar next to the clock. The application uses ports to connect to or from a LAN or the Internet. PropelAC.exe is not a Windows core file. The process can be removed using the Control Panel's Add\Remove programs applet. The program has a visible window. Therefore the technical security rating is 12% dangerous, however you should also read the user reviews.

Uninstalling this variant: In case of problems with PropelAC.exe, you can uninstall the associated program (Start > Control Panel > Uninstall a Program > Propel Accelerator or BellSouth Accelerator).

Recommended: Identify PropelAC.exe related errors

External information from Paul Collins:

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

is a warning pop upthah pop every second and disterbwith all the programs i have the warning on and off
  gloria duarte  
it is a internet connection accelerator distributed by PenTeleData, an internet dialup provider
  david keevil   (further information)
This is a suspect application......
was installed with Bellsouth Accelerator. now i guess we know who makes their accelerator for them!
    (further information)
accelerator program for browser
  john sutphin   (further information)
i know that on my comp. every time i install it it messes up IE so that it has to be on before pages will load. it came with bellsouth dial internet service cd. bellsouth told me they know of this problem
  wade catrett  
PropelAC.exe is a browser accelerate for dial up connections
  Bryan Dean  
it played havoc with my sound system and would not allow me to get5 online even though I have a DSL connection rather than dialup
  charlotte cuno  
It is an internet accelerator. I have it and mine was provided through It hurts nothing and with mine my pages load on my browser whether I use it or not.
It is an internet accelerator I had installed from IServ Dial-up services.
  Bill Vriesema  
Beware removing Bellsouth Accelerator from Add/Remove Programs. If fried my IE and Bellsouth tech support could/would not help me but rather directed me to my current DSL provider. Luckily, I still had the install program on my desktop and after re=installing IE worked fine. It must be removed from the Bellsouth Accelerator in "all programs".
I know that when it is enabled on my PC running windows XP it keeps causing Norton Liveupdate to disconnect several times before the update succeeds.
PropelAC.exe is the process name for a variety of differently branded browser accelerator programs distributed by various dialup internet providers. It works by altering Internet Explorer proxy settings and as such when not running IE will not work properly. Uninstalling Propel should automaticly remove these proxy settings, though they may need to be removed manually on occasion.
  Richard Mongler  
Only necessary if you run the Propel Accelerator
  joi de vivre  
Works fine on WinXP-SP2
  Michael Emler  

Rating chart

Summary: Average user rating of PropelAC.exe: based on 15 votes with 15 user comments. 7 users think PropelAC.exe is essential for Windows or an installed application. 5 users think it's neither essential nor dangerous. One user suspects danger. 2 users think PropelAC.exe is dangerous and recommend removing it. 2 users don't grade PropelAC.exe ("not sure about it").

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Best practices for resolving PropelAC issues

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

PropelAC.exe [all]