Many of the visitors here use Windows System. The most common observation is that people use the same installation done by their dealer for years without even restoring the backup they have been provided. Its better for users to reinstall Windows after some time as there may be some performance changes during the period of time due to repeated installation and removal of third party softwares

Usually the
time format after a fresh
Windows installation will be in
24 hour format which is most undesirable for many of the users. You can
change time format from default 24 hours to 12 hour format just within few seconds. Here is how one can achieve that.
Open
Control Panel > Regional and Language Options

Now, click
Customize this format button. You will be shown up with customization window, goto
time tab.

The default 24 hour format will be displayed as
HH:mm:ss. If you want to change time format, you need to change the way as you wish depending on the instructions / notations given in the image. In simple words, if you want to have your new time format to be of 12 hour type, modify the default
HH:mm:ss to
hh:mm:ss. Now you will see the changes come into effect after you click Apply / OK. The same procedure works fine with
Windows XP or Windows VISTA