I think it's your PC.
Luckily, practically no-one needs it. Good alternatives are foxit reader (be sure you don't install the ask toolbar) from www.foxitsoftware.com and nitro pdf reader from http://nitro-pdf-reader.nl.softonic.com/download
I cannot get Adobe reader 11 to down load to Vista,is there a compatibility issue?
I keep getting the message that it did not install correctly,is it my computer or is it Adobe?