Ok, well the whole story goes like this...
I purchased my computer in November of last year and had major hassles with it since...and most recently just had one of its hard drives replaced as it was faulty.
Since then I have had to reinstall almost everything I had previously. Therefore, I am pretty sure I have reinstalled acrobat correctly...the up to date one (version 7) however when I was trying to re-install my internet connection it kept saying i had to restart for install of acrobat to be completed correctly....so i restarted my computer but kept getting the same message.
Previous to having my hard draft changed over i was opening pdf's without a hassle.
I have Internet explorer 6