Your link isn't available to those of us who don't 'do' Facebook.
However the message you're seeing doesn't seem to mean much anyway:
http://billing.ragesw.com/knowledgebase.php?action=displayarticle&id=113
It's probably more likely that a shortcut has gone missing than the actual program. Try going to 'My Computer' or 'Computer' (depending upon your version of Windows), double-clicking on the icon for your hard drive and then on 'Program Files'. (You might need to go via your Windows account name to get there, depending upon your version of Windows and how it's configured).
Then double-click the Malwarebytes Anti-Malware folder and on the Mbam icon. If that launches the program you'll know that it's simply a shortcut problem. Close the program and right-click on the Mbam icon, selecting Send To > Desktop (Create Shortcut). Problem solved.
If that doesn't work, download and run the program's uninstallation tool from here:
http://downloads.malwarebytes.org/file/mbam_clean
ensuring that you restart your computer at the end of the process.
Then download and install Malwarebytes Anti-Malware again from here:
https://www.malwarebytes.org/antimalware/
taking great care to remove the tick, which you'll see during the installation process, against an option to take a free trial of the 'Premium' version