Malwarebytes released an update for its component package that fixes the problem with Windows 7 stations freezing. The problem was manifesting on systems with the Web Protection feature enabled in the security solution. The company could not find a solution immediately as the bug was not reproducible on all machines. The only way to get out of the lock was to reset the computer by holding down the power button. On Friday, the company announced that it had prepared a test preview build designed to eliminate the snag.
Source: https://www.bleepingcomputer.com/news/security/malwarebytes-fixes-windows-7-freeze-problem-in-new-update/