I started the update process to an iMac on Friday from 10.11 to 10.11.1. I checked the computer today and it had me input my iCloud password and indicated that it was finishing the update process. But then the user account I normally use on this computer appears to be corrupted. None of the applications can be launched. The whole thing is sluggish and not useable. Constantly spinning beach ball. I am able to log into my other user account and it behaves normally. I ran the first aid utility under disk utility through the account that is working but it didn't seem to have any affect on the other account. I've tried switching my startup disk to a Super Duper back up but its not letting me for some reason. All the applications say they can't be opened because "they may be damaged or incomplete." Any thoughts on what is going on and what I can do to fix this?