There is no widely recognized official software or mainstream utility known as "sxsi x64"
If you are trying to install SxSI-related drivers for professional media: sxsi x64 windows 8
If the WinSxS store itself is corrupted (common after improper updates or disk errors): There is no widely recognized official software or
The installation was eerie. There were no "Hi, we’re setting things up for you" screens or swirling blue gradients. It was a cold, black-and-white text interface that moved with terrifying speed. In under four minutes, the system rebooted. sxsi x64 windows 8
The WinSxS folder is also central to several common Windows 8 x64 errors.