id summary reporter owner description type status component version resolution keywords cc guest host 12734 4.3.8: VERR_CPUM_TOO_MANY_CPUID_SUBLEAVES when launching VM [FIXED in SVN] mmcginnis "I just installed VirtualBox on a Lenovo T410 with Hyper-V enabled. Upon launching a VM I get the lowwing error: Failed to open a session for the virtual machine XP Virtual. Couldn't find the end of CPUID sub-leaves. (VERR_CPUM_TOO_MANY_CPUID_SUBLEAVES). Result Code: E_FAIL (0x80004005) Component: Console Interface: IConsole {8ab7c520-2442-4b66-8d74-4ff1e195d2b6} " defect closed other VirtualBox 4.3.8 fixed Too many cpuid subleaves Windows Windows