A few days ago , Microsoft issued Vulnerability-related.PatchVulnerability an emergency patch for Internet Explorer to fix Vulnerability-related.PatchVulnerability a zero-day vulnerability in the web browser . The problem affects Vulnerability-related.DiscoverVulnerability versions 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 installing Vulnerability-related.PatchVulnerability the KB4467691 patch they are unable to start Windows . When the patch was released Vulnerability-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 updated Vulnerability-related.PatchVulnerability the patch page to indicate Vulnerability-related.DiscoverVulnerability a 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 provide Vulnerability-related.PatchVulnerability an update in an upcoming release '' .