With yesterdays cvs tree and SMP=1,ACPI=1,DBG=1,KDBG=1 and deleted vmwinst.exe I got this bugcheck on real HW, when it is doing initial boot to display ROS`s syssetup, SMP machine : (ke/ipi.c: 91) Waiting longer than 5 seconds to start the ipi routine KeBugCheck at ke/ipi.c: 92 snip (api.c: 758) Spurious interrupt on CPU(0) Regards, David