id summary reporter owner description type status component version resolution keywords cc guest host 9401 IRQL_NOT_LESS_OR_EQUAL BSOD Bruce Williamson "Upgraded to V4.1.0 Installed Oracle_VM_VirtualBox_Extension_Pack VM booted without a problem Upgraded Guest Additions to V4.1.0 VM fails to boot with the following error IRQL_NOT_LESS_OR_EQUAL " defect closed guest additions VirtualBox 4.1.0 obsolete Windows Linux