Querry in event log

i am gtg a regular entry (error) in windows system log as shown below:--

-----------------------------------------
A corrected hardware error has occurred.

Reported by component: Processor Core
Error Source: Machine Check Exception
Error Type: Unknown Error
Processor ID: 1
---------------------------------------

my processor is amd athlon and the os is windows 7

can any one explain what does it mean?

thanks in advance