If you want to make your windows XP,Vista Machines look like ubuntu you need to follow this procedure
Start with the visual style, if you haven’t already install Uxtheme Multipatcher, this will remove the limitations on your system, in order to install new themes. Then download the Human Visual Style
Go to C:\Windows\Resources\Themes and safe your download theme in there.
Now right click on your Desktop and click on Properties. Go to Appearance and select Human as the theme.
Now change the icons, first install Icontweaker,after that install Ubuntu Icontweaker theme
Next, change the wallpaper on your desktop, get the Ubuntu wallpaper Here or here .
To replace the icons for Windows Explorer, first install Styler toolbar (free),get the Ubuntu Human Theme for Styler.
Now get the famous ubuntu Cursor
Now, what everybody wants. The alternative to Beryl on Linux.GET IT HERE , and get that “3D CUBE” effect.
To change the boot screen download BootSkin (it’s free): Get it Here .
And download the Ubuntu Bootskin
To get Ubuntu Logon screen go here.
For Mozilla Firefox Web Browser, you can install the Ubuntu Theme, Dapper Retouched for Opera
Theme for WinRAR from here
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Simply download this and install in your windows machine