Getting "Antivirus Engine is not initialized" Error Message


I have discovered that my antivirus database is not updating. When I try to do it manually, I get the error message shown in my subject line: Antivirus Engine is Not Initialized". Now, before anyone sends me off to another thread that supposedly resolves this very error, please understand that I have followed all the steps given in that thread:

  1. Deleted the “base” file from “scanner folder” and copied the “base” file from the “repair” folder to the “scanner” file. This didn’t fix the problem.

  2. A few posts down in that thread talked about running a manual update from the CMD prompt. That didn’t fix the problem.

  3. The third and final suggestion was downloading the COMODO Registry Cleaner and running the scan/fix. That didn’t fix the problem either.

I’m still getting the “Antivirus Engine is not initialized” error.

I’m running COMODO under Windows XP.
Version 3.12.111745.560 of COMODO

Others having this problem seemed to have those steps, even step 1 alone, resolved their problem. None of the three fixes worked for me. Does Development Support staff have a fix for me? I am confident that I followed the steps as provided in the thread which seem to be properly written directions.



What thread ? ? ?

I have searched for “Antivirus Engine is not initialized” and got 8 results - which did you follow ?

Please note that no registry cleaner, including the Comodo version, will fix your problem unless you :-

  1. UN-install C.I.S. ;
  2. Then purge remnants with the registry cleaner ;
  3. Disable all adware/malware/protection that may interfere with a repeat of
  4. Install C.I.S.


The solutions begin on the last post of page 3.

The registry cleaning “solution” was to fix a virus signature database version numbering problem. It was speculation that it would fix this problem. Point is, the solutions that work for others isn’t working for me. Are those other solutions no longer valid for this version of COMODO? These solutions were provided in December of 2008.


You seem to have looked at ancient solutions for CIS 3.5 when bases.cav was only 15 MB.

Things are quite different now.

A clean install as I have outlined is likely to give you another chance.

There may be less drastic solutions, but you may spend a lot of time trying them out,
and each potential solution may actually cause additional collateral damage.


Does the following work for you?

Try updating the Comodo Internet Security Helper Service (control panel, admin tools, services, right click on “Comodo Internet Security Helper Service”, properties). The logon Tab for the Service should currently show Local System Account and Allow service to interact with Desktop. Set This Account with your Logon ID and Password (+Confirm) and then reboot.