Watch out for Google "sneakware" on Microsoft Windows!
If you use Picasa, Google is installing Google+ Auto Backup even if you don't use or want Google+.
And Google is enabling Chrome to always run in the background for Notifications and Hangouts with just brief popup notices.
All are privacy and security issues and a drain on system resources.
- To get rid of Google+ Auto Backup, uninstall it in Control Panel.
- To stop Chrome running in the background, open Chrome > Settings, Search settings for "background", and uncheck "Continue running background apps when Google Chrome is closed".
- To stop Hangouts, open Chrome > Tools > Extensions, go to Hangouts, and uncheck Enabled (or click Delete).