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Can't Update Malwarebytes

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I have re-installed malwarebytes (3) times but still get the same error when attempting to update:


An error has occurred. Please report this error code to our support team.

MBAM_ERROR_UPDATING (122, 0, MultiByteToWideChar)

The data area passed to a system call is too small.


Any suggestions? Running XP.


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Hello JackJ, :)

Have you tried a clean install as shown in the following -

Please follow the instructions below:

For Windows XP:

  1. Click on Start and select Control Panel
  2. Open Add/Remove Programs
  3. Uninstall Malwarebytes' Anti-Malware
  4. Restart your computer very important
  5. Download and run mbam-clean.exe from here
  6. It will ask to restart your computer, please allow it to do so very important
  7. After the computer restarts, temporarily disable your Anti-Virus and install the latest version of Malwarebytes' Anti-Malware from here. Remember to enable your Anti-Virus after installation.


  • You will need to reactivate the program using the license you were sent via email if using the Pro version
  • Launch the program and set the Protection and Registration. Then go to the UPDATE tab if not done during installation and check for updates.
    Restart the computer again and verify that MBAM is in the task tray if using the Pro version. Now setup any file exclusions as may be required in your Anti-Virus/Internet-Security/Firewall applications and restart your Anti-Virus/Internet-Security applications. You may use the guides posted in the FAQ's here or ask and we'll explain how to do it.

If that cannot solve the problem, would you mind telling what anti-virus / internet security/ firewall (and what version they are) and other security software are on your system? In addition, is the system experiencing any symptoms that it might be infected?

Thanks :)

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Just a suggestion...

A lot of the new spyware variants change proxy settings on the computer that will prevent internet access.

Try this:

1) Go to Control Panel and choose"Internet Options" (this can also be accesses from the tools menu in Internet Explorer).

2) Go to the Connections tab and click the"LAN Settings" button.

3) Uncheck the option to use a proxy server for your LAN.

I hope this helps. :)


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