hah, who's the weirdo with the mobile phone in the background?
Nice thing the show didn't skip a week because of TechEd. Keep it going.
To the WinSxS folder. Not only the C++ Runtimes are stored there, also this folder replaces the old folder structure of backup files created when you install Windows Updates.
And this is the MAIN cause the folder grows over time. After years of requests amd discusion, MS added my request in Windows 8 to removed updates which are replaced by newer one. You can use DISM or the diskcleanup wizzard to remove them and clean a lot of space: