Windows Experience Index for Windows 8.1 Changelog
What's new in Windows Experience Index for Windows 8.1 1.1
Nov 8, 2013- The tool no longer needs the .net 3.5, just 4.0 which is embedded in Windows 8.
- The availability of Re-evaluating the performance. (this can be useful after installing a new hardware (CPU, RAM, SSD), or updating display card driver, or installing DirectX 9.0c, etc..