I used Adobe as my PDF reader for years, but just got fed up with it's terrible security holes that keep cropping up. It's probably the weakest security vector on many computers.
I would recommend changing to the free and reletively small FOXIT, which does everything that Adobe does.
Adobe/Acrobate is a huge bloated security riddled program which need to be re-written from the ground up.
Some companies refuse to use it because of the security issues, and if I remember correctly Steve Jobs said you couldn't use it on some of his products due to the poor security - although I suspect there is more to it than just that.