If Malwarebytes will not start or scan......
Malwarebytes Chameleon is a set of new technologies developed by us to help get Malwarebytes Anti-Malware up and running on a system when it is prevented from doing so by specific malware infections.
To access Chameleon, open your START menu and click on All Programs > Malwarebytes Anti-Malware > Tools and click on Malwarebytes Anti-Malware Chameleon.
If your START menu is empty or inaccessible due to the infection, then you may alternatively open it through the Windows Task Manager. To do so, press Ctrl+Shift+Esc on your keyboard. Once the Task Manager opens, click on File at the top and choose New Task (Run). In the "Create New Task" box, click on the Browse button. In the window that opens, navigate to C:\Documents and Settings\All Users\Start Menu\Programs\Malwarebytes' Anti-Malware\Tools for Windows XP or C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Malwarebytes' Anti-Malware\Tools for Windows Vista and Windows 7, then click on the drop-down menu that says Programs and choose All files. Double-click on Malwarebytes Anti-Malware Chameleon.lnk (it will appear as a help file).
You may also open Chameleon directly from your internet browser by pressing Alt on your keyboard and using the File > Open or Open File menu and navigating to C:\Documents and Settings\All Users\Start Menu\Programs\Malwarebytes' Anti-Malware\Tools for Windows XP or C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Malwarebytes' Anti-Malware\Tools for Windows Vista and Windows 7, then double-clicking on Malwarebytes Anti-Malware Chameleon.lnk (it will look like a help file).