Windows 8 UX Pack description
The best way to get Windows 8 user experience without modifying system files
Windows 8 UX Pack will give you Windows 8 UI improvements such as theme and logon screen without touching system files at all so it won't have such risk to harm your system at all.
In this package, you'll have Windows 8 inspired themes and applications to make your system resembles Windows 8 as much as possible without modifying system files. Give your desktop a visual boost with the Windows 8 UX Pack.