Hello, I just want to know what is the utility of refreshing the desktop, does we have to refresh the desktop frequently and what is 60 hertz or 70 hertz,in relation to refreshing strength.
Thanks in anticipation.

   I think gshibu5 wants to know what the screen refresh rate is in the display settings.  I have changed the title of this thread to reflect that.
   The refresh rate can be set by going to Control Panel, then to Display, then to the Settings tab and clicking on the Advanced button.  Then go to the Monitor tab and it is in the Monitor settings section.  There is a dropdown box that allows you to set the refresh rate.
   It is best if you just leave it where it is.  Changing it to a rate that your monitor does not support can mess up your display and keep you from being able to see enough to set it back.
   1 hertz is one cycle per second.  So 60 hertz means that the monitor projects the image on the screen 60 times a second.
   If your screen flickers, it could be because the refresh rate is not correct.  If this were the case, changing the refresh rate would correct the flickering.
   That is about all I know about that subject.  I have never changed the refresh rate or messed with it.  Maybe someone else knows more.

Ray, now i know what is refresh rate. I have seen many users refreshing there desktop by right clicking the mouse and clicking the refresh tab. i wonder what is its use anf if at all it is needed.Hope i am clear.

   OK, I guess I misunderstood that.  Sorry about that.  I have renamed this thread again.
   Right clicking on the Desktop and selecting Refresh, redraws the screen.  Usually the desktop refreshes automatically when changes happen to the screen (like a program closes), but sometimes the Desktop does not catch the change and so it fails to redraw.  Selecting Refresh will force the desktop to redraw.
   For example, lets say that you had the browser open and you closed it.  Maybe the browser closes but the shortcuts on the desktop behind where the browser was do not appear.  If you select Refresh, they will appear.
   The desktop seldom gets in a situation where Refresh has to be used.

I don't think it matters much any more now that most people are using TFT monitors but with the old CRT 60hz ( the Microsoft norm) could give people headaches if used for too long. The VESA safe minimum was 72hz.  

Thanks very much Ray, you just suberbly clarified the point. Thanks!!