Adobe's PDF reader has gotten more and more bloated over the years. It used to be a slim addon, used to (wait for it...) read PDF. Seems like a pretty simple function, right?
So why does it take up over 200MB of space on your hard drive, and why does it seem to want to update (automatically!) every other day?
We have no idea.
What we do know is that the excellent Foxit Reader does everything the Adobe Reader will do, but clocks in at only 6MB installed. No nagging updates.
Do yourself a favor, uninstall Adobe's bloatware, and grab Foxit.