idle process?

[baba ali]

Hello 

My machine is responding really slow now.After I run Process viewer 
program,here is what I find

Process:Idle  Pid : 0x0  Cpu :76%  Desciption:system idle
Priority:0     Thread :0
Properties : no path , no command line , no current directory
             no parent ,no version


Did my machine get infected with a malicious code,How come a process 
running idle can take up to 76% of Cpu ?

Thank you again!

Baba