Hi, I've just installed the Windows 10 Anniversary Update on two family desktop computers, so wanted to report the glitches we encountered, and how we fixed them.
On my desktop, the classic shell program got completely borked, but I was able to fix that by uninstalling it and then installing a new compatible version v4.3.0 available from http://www.classicshell.net
On my wife's desktop, classic shell also got borked, but I was able to fix it as described above. However, in addition, Zemana Antimalware free got deleted from her desktop somehow. I was able to reinstall it, though, and it worked fine after that.
Finally, we had something called Win 7 Games for Windows 10 installed, so she could play the old, original versions of Freecell, etc. That program also got completely messed up. I was able to fix it by uninstalling the program, manually deleting all of the game entries in the start / programs menu, and then installing the latest updated, compatible version from http://winaero.com
Best wishes to all.