My guess are these machines are all run by the same owner. So they might install McAfee and Teatimer and one day with some update, it all falls down. That's just one example I encountered.
Given the slim details I can't give you any other clues.
Try Grif's scans since something odd is going on with that Cpuid.
I'm experiencing very annoying issue. CPU loaded with System Idle Process always. Because of that there is serious lag in iterfase. Problem appeared almost sumultaniusly on there different PCs. Using "Process Explorer" and going to System Idle Process - Threads I've found processes with names:
ntoskrnl.exe!KiDespatch Interrupt+0x650 (on one PC)
ntoskrnl.exe!KiCpuId+0x6a0 (on two others)
I have three diffenent machines - one old acer laptop, one modern desktop and wmware virtual machine running on macbook. All have same OS - win 7 ultimate sp1. All of them are in the same network.
I've tried to localise issue by removing services and applications from startup - nothing, I've scanned machines with microsoft security essentials, Dr Web CureIT and Kaskpersky virus removal tool. Still nothing.
CPU get loaded as soon as system starts. Number of ntoskrnl.exe instances equals to number of CPU kernels. 1, 2 and 8 in my case on different PCs .
I've been googling the whole Sunday - nothing helped. Some suggest that it is hardware related... apparently it is not as it happend to three complitely different computers.
Can' anyone suggest what else can I try?