Compaq n600c hang problem plz slove my problem

Please give more information Like --
After how much time it hangs?
what OS u r using?

in general answer --
open task manager (pressing CTRL,ALT, DEL keys) this will bring up Windows Task Manger, click on Application, highlight any task that is Not Responding and click on End Task. 

Also, to make your CPU boot up faster, I would
click on Start
click on Run
type msconfig.exe (this will open System Configuration Utility box)
click on the Start Up Tab
(you will see several boxes checked under Startup Item). And look for programs that you don't want to launch every single time you log on. (such as Realpayer, yahooMessegner, realsched, etc). 
Uncheck the boxes and this will require a reboot. Your computer will bootup a lot faster. These programs you can always open when you want. You can always tell if you have a lot of programs that startup when you turn on your cpu and in the righthand corner, where the time time is at, you see a lot of icons. 

Also if you can always open up task manager again, click on Processes, find explorer.exe and kill that process, this closes everything on your screen. dont worry... 
then in task manager 
click on FIle
New Task Run
and type explorer.exe and click OK
and you will see all your icons pop back up on the screen.

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Thanks