not able to add paypal addon

Hey guys… I had to turn off ordering for a bit on our store and chose to disable payments so that it would be what I thought an easy fix when I was ready to turn it back on. Well we had paypal as our payment method before, however it is not listed in our payment methods. It appears I need to add the paypal addon in order to set up paypal again, however when I try to install the add on I keep getting error messages.

It is required to examine issue directly on your server. What kind of errors do you receive?