The MS14-045 update to Windows 7 causes users to get a “blue screen of death” or “Stop 0x50” error on their computers. This error makes it so people cannot use their computers unless they do a system restore. Microsoft asks that users uninstall the update before they encounter the error if possible:
Microsoft is investigating behavior associated with the installation of this update and will update this bulletin when more information becomes available. Microsoft recommends that customers uninstall this update. As an added precaution, Microsoft has removed the download links to the 2982791 security update.