Bad Image (0xC000020) error - McAfee gone mad

If suddenly some of the .DLL files on your computer get size of ZERO (0 bytes) and you are getting “Bad image (0xC000020)” error preventing applications from running, it is most likely your McAfee antivirus that is doing the destruction to the DLLs on your computer, see similar reports from other softwares

Really, most antiviruses do nothing but slow down your system and do not really offer any protection for new threats (despite vendor claims). Use Microsoft built-in antivirus. It is as good1 as any others, but at least does not destroy your files. As for safety - simply backup your computer periodically, don’t open suspected attachments, don’t use cracks, don’t visit illegal sites, don’t use public free WiFi and isolate your computer from the outside using NAT router/firewall. As simple as that.

1As good as does not mean that it will protect you everytime. It means that it will protect you from OLD threats as any other antivirus. No antivirus is able to protect against newly released virus. Your best line of defense is: full system image backup done periodically (say weekly). In case of new threat you can always restore your computer from full system image backup.

I just installed Amibroker into my new computer. The Amibroker was working fine. When I retart my computer. Amibroker can’t run. Computer popup is message "c:\program file\Amibroker\MiscTool.dll is either not designed to run on Windows or it contains an error. … ". I found the size of MiscTool.dll is zero. Then I reinstall AB. It worked ,but not the next time after reboot. Would someone help me.

Maybe you are using McAfee antivirus?

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Many Thanks. It works. : )

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What works? McAfee? No It doesn’t. I don’t know what these guys at McAfee are smoking but DESTROYING files on somebody’s computer is crazy and they are liable for damages they deliberately made. This is not what antivirus is supposed to do.


Sorry for my late reply.
I deleted McAfee and re-install Amibroker. Then Amibroker resume to normal. It works fine. Thanks.

Hi Tomasz,

Just wondering, if there’s a way to tell McAfee to treat Amibroker as a “trusted” program and avoid having the dll’s impacted.

Also, I don’t seem to have this Amibroker issue with any other program I use. So it begs the question: What’s so special about Amibroker that McAfee has targeted certain of Amibroker program files?

Lastly, is there no chance to develop around this issue to accommodate McAfee?


Really, READ THIS THREAD from the beginning. There are links to OTHER programs being treated the same as AB and experiencing the same, so your impression that only AB is affected is just plain wrong. FOLLOW THE LINKS in first post !

There is nothing special about AmiBroker, just google and you will see thousands of examples of other programs, including multi-thousand $$$ programs like Autodesk Maya 3D (professional 3D rendering soft), Adobe Lightroom and many many others being destroyed by McAfee.
The most amazing/funny/scary part is that they are corrupting DLLS of their own products too

I am completely lost without words that you expect “victim” to accomodate for “attacker”. That is absurd. What McAfee does is just WIPE your files without warning and without reason. McAfee should fix their wrong doings or … (easier, quicker, better) you need to just get rid of McAfee from your computer.

I think I might have found a workaround for this issue if one is running McAfee LiveSafe. (My preference is to run McAfee as I like to have redundancy with firewalls and antivirus, just in case either Microsoft or McAfee fails to catch something on its own, and is generally a good strategy to protect your PC)

Go to Settings, then Firewall, then Internet Connections for Programs, then search for Amibroker program name/icon, then highlight it, then click Edit, then scroll to the bottom and turn Net Guard to Off. Since doing this the other day, I have not experienced an issue which was occurring 2-3 times a day!

You might also want to do the same for all other AB components such as AmiQuote, if they ever begin to act up, or to prevent them from acting up in the first place.

Hello every single time i start amibroker i get an error.
C:\Program Files (x86)\Amibroker\MiscTool.dll is either not designed to run on Windows or it contains an error. Try installing the program again using the original installation media or contact system administrator. Error status 0xc0000020.

I have to then go to amibroker site and install the software again which does upgrade and then it starts. It is shut it and re open it gives the error again.

Tomasz, or others - can you please help tell me how i can stop this?


Found this topic already covered - i followed the advise but not sure if it will fix my issue.


Antivirus craziness continues, now “Hello world” program is marked by several antivirus companies as harmful:

#include <stdio.h> 
int main() 
  printf("Hello world!\n"); 
  return 0; 


In fact one of the commenters tried the program that is empty doing exactly nothing

int main() { return 0; };

and that was too marked as harmful by 18 antiviruses.

Interestingly, it seems that McAfee shifted his interest from his antivirus to trading. Smart move :slight_smile: