Welcome to LQ!
It sounds very much like ypu're trying to run Windows programs on Linux which in general is not the way to do things.
There are Linux applications which will open PDF files, e.g. Okular and Open Office will both read and write pdfs.
The next question is why you would want anti virus protection as Linux tends to have very few viruses (I've had no protection on any of my systems since I started using Linux in 2000.
Whatever distribution you have, most software is installed from repositories on the net(no CD required!), not on a per-manufacturer's-site basis or CD/DVDs like Windows. Check for a Software manager.
Read this which helps explain the differences: http://linux.oneandoneis2.org/LNW.htm
You could nearly say it's obligatory!
On re-reading your post... You are
running Linux are you or should you be asking your questions in a Window's forum?
Ok. OK. I've just seen the Fedora logo in your profile.