an emergency patch for Internet Explorer to fixVulnerability-related.PatchVulnerabilitya zero-day vulnerability in the web browser . The problem affectsVulnerability-related.DiscoverVulnerabilityversions of Internet Explorer from 9 to 11 across multiple versions of Windows , but it seems that the patch has been causing problems for many people . Specifically , people with some Lenovo laptops have found that after installingVulnerability-related.PatchVulnerabilitythe KB4467691 patch they are unable to start Windows . When the patch was releasedVulnerability-related.PatchVulnerability, it was known that there were a few issues with older versions of Windows 10 -- for example , problems with the .NET framework , and with web links in the Start menu . But since the initial release , Microsoft has updatedVulnerability-related.PatchVulnerabilitythe patch page to indicateVulnerability-related.DiscoverVulnerabilitya further potential problem with some Lenovo laptops : After installing KB4467691 , Windows may fail to startup on certain Lenovo laptops that have less than 8 GB of RAM . The company goes on to suggest a couple of possible workarounds for those running into issues : Restart the affected machine using the Unified Extensible Firmware Interface ( UEFI ) . Disable Secure Boot and then restart . If BitLocker is enabled on your machine , you may have to go through BitLocker recovery after Secure Boot has been disabled . Microsoft says that it is `` working with Lenovo and will provideVulnerability-related.PatchVulnerabilityan update in an upcoming release '' .