I think you are referring to the event viewer?
Click start, right click my computer, click manage, click event viewer under system tools. Then I suggest you click hardware.
Could be a number of different things. Try booting into safe mode and see if things run OK in there?
Failing that you can run Memtest (http://www.memtest.org/) or take the side off of your system and see who manufacturered your hard drive. You could then run that manufacturers diagnostics on the hdd. Otherwise it could be temperature? Check to make sure your CPU fan isn't full of dust.
Anything in particular you do with your system? Anything in particular which seems to trigger it to freeze? What are you normally doing when it freezes?