I upgraded my desktop PC from Win7 to Win10, in July, then last Thursday (9/23) the Anniversary build got installed. After the update my computer was running super sluggish and things wouldn't open/run properly: I couldn't open the Start menu, type anything on the search mar, couldn't open the Settings portion...nothing. I ended up reinstalling Win10 fresh on my desktop so I can get rid of the sluggishness. I ran all the system updates, including Anniversary update, and so far everything running OK. Now I'm reinstalling all my previous applications again.