The KB2840149 patch that caused Win7 unlimited restart has been replaced by

Computer Store News: In April 2013, "Patch Tuesday", Microsoft released a file system kernel named KB2823324 for Win7. Mode-driven updates. Unfortunately, this update has caused some users to fall into an infinite restart loop. To this end, Microsoft had to issue another KB2839011 patch to solve the bug of unlimited restart. Now, Microsoft has provided a new security update ——KB2840149—— to replace KB2823324 which may lead to an infinite restart.

Microsoft said in an official blog post, "As we discussed earlier, when we learned that some users had problems, we stopped the (KB2823324) security update. distribution. The new update (KB2840149) is still used to address the 'moderate' security issues described in MS13-036 and should not cause (infinite restart) problems. Obviously, the original update caused conflicts with certain third-party software and caused system errors. Microsoft must update it immediately to prevent more problems from being pushed to the table. The company eventually released a second update and removed the previous update. If you have a Windows 7 user with automatic updates turned on, you most likely have already downloaded the update.