СпасибоThe number you see in that column doesn't actually refer to the number of CPUs in use. If you look at the Microsoft page that explains the column headers (look for the heading titled "CPU Usage"), you can see that the number actually represents:
The percentage of time that a process used the CPU since the last update
This is the reason that the sum of all values in the CPU column never go above 100, as that would imply that the CPU is at more than 100% usage, which doesn't make sense.
In Windows 8, percentages are displayed instead of pure numbers, which clears up some of the inherent confusion.