It's probably a cracked and illegal version of Windows. Your best bet is to download a use a custom theme. You'll need to install some software and swap some files to do so but you should be able to find a theme that does what you want.
Theme - How to Apply Custom Themes
Using Univeral Theme Patcher
You can find themes at a multitude of places, but my favorite is Deviant Art.
http://www.deviantart.com
Windows 7 Themes @ DeviantArt
Note: If your theme requires changing explorer.exe, explorerframe or other system files you'll also need this program:
http://www.thewindowsclub.com/window...-themes-easily
Using Windows Theme Installer
First swap out the files via the tutorial above (after disabling UAC) then close explorer.exe via task manager, open this program and install the theme along with it's system files. You'll need to restart, but once you do your theme will be installed.
Apparently version 1.1 of the above Windows Theme Installer does the work of the Universal Theme Patcher mentioned in the tutorial. However, I'd still recommend using both programs because the UTP allows you to revert those files separately.