Instead, use the built-in Windows tools to safely reclaim space:
If your "sxsi" query refers to professional Sony SxS memory cards, ensure you have the specific x64 driver version 2.0 or later for Windows 8 compatibility. sxsi x64 windows 8
If you cannot enable .NET 3.5 through "Turn Windows features on or off," you can use the DISM tool to point directly to the sources\sxs folder on your Windows 8 installation media. Instead, use the built-in Windows tools to safely
Users often find this folder consumes significant disk space, sometimes exceeding 15–20 GB. However, from this folder, as doing so can permanently break your operating system. sometimes exceeding 15–20 GB. However