id summary reporter owner description type status component version resolution keywords cc guest host 9847 VB 4.1.4, kernal driver error sbirch3 "After upgrading to VB 4.1.4 r74291, with 4.1.4 extensions installed I get: ""Cannot access the kernal driver!"" when starting a VM, new (with a new blank .vdi) or existing. After clicking on ""Abort"", I get: Failed to open a session for the virtual machine 16. The virtual machine '16' has terminated unexpectedly during startup. Result Code: E_FAIL (0x80004005) Component: Machine Interface: IMachine {5eaa9319-62fc-4b0a-843c-0cb1940f8a91} When opening settings, I get ""Failed to access the USB subsystem"" & the same error codes. I have uninstalled (even used ""advanced uninstall"" to clean up) & reinstalled older versions from ver 4.0.2 to 4.0.14 with the same result. Host= Win7 Guest= Win xp, ubuntu " defect closed other VirtualBox 4.1.4 obsolete Windows Windows