Adobe Application Manager.
This installed itself on the top task bar of my iMac without asking - just appeared. I was loathe to download but my son said it would be ok. That was Sunday and since that time I have real problems with my keychain. I was locked out out of my computer this morning with the message "com.apple.icloudhelper wants to use login keychain" I was frozen out and unable to login to my computer, it would not accept my apple account password. Nothing else has changed or been downloaded so I put this down to the Adobe Application Manager. I really don't understand why/how it arrived on my task bar nagging to be downloaded & is as bad as any mal wear. How do I get rid of it and why has it altered by keychain? I have an iMac running OS X Yosemite version 10.10.5
Very very annoyed by this.