Microsoft's Window operating system offers plenty of ways to customise your PC.  As well as personalising the interface with themes, or changing the background image on your desktop, you can also adjust the sounds used by the OS as well.  You can even change the entire sound theme, or just customise it with sounds of your own.  Here's how to change the sound effects theme in Windows 7.

Step one
From the Start menu, select the Control Panel.

Step two
Choose Appearance and Personalization then click Change sound effects.

Step three
Windows offers a selection of Sound Themes that have different audible alerts for various events. You can use the drop down menu underneath Sound Scheme to change the theme. If you want to hear what the various sounds are like before you apply them, simply click on one of the activities list underneath Programme Events and press Test to hear the sound.

Step four
Alternatively, you can customise a sound theme yourself, by clicking on one of the programme events and then selecting a tone from the drop down menu located underneath Sounds. You can also use a sound file stored on your hard drive by pressing Browse and using the Windows Explorer button to trawl your PC. Press Test to listen to the sound you have selected.

Step five
You can also stop Windows from playing a start-up sound by unchecking the box next to Play Windows Start up sound. Press Apply and your changes will be implemented, then press OK to close the window.