Windows XP has different look and feel than its earlier versions.Some user may not like this interface, because they are used of old classic interface.So,lets change XP interface to old classic interface.
Change theme to windows classic theme.
Right click on desktop-->>Properties-->>Themes-->>select Windows classic-->>Apply-->>OK
Next we have to change the look of start menu.
Right click start icon-->>Properties-->>Start Menu-->>Select "classic start menu"-->>Apply -->>Ok

Now we have windows old classic look.