I've been reading as much as I can about the basics of Linux but my head keeps going back to Windows and DOS (at least the Change Directory CD command is the same!). I thought that adding some form of Linux as a second boot option would provide me firsthand experience (as a visual thinker it's necessary) to understand it.
When I changed the OS of my box from Vista Ultimate 64 to Win 7 Pro 64 the first thing I did was tear the whole thing apart to try and find every nook and cranny of the new OS. I then wiped clean and re-installed. I'm thinking I'd be best doing that with whichever Linux I choose also. I must protect my Windows OS 64bit on the other partition though. I cannot allow viruses to bleed over from the Linux version to the unprotected Windows. (if Windows isn't running neither is my Windows Antivirus suite).
Ubuntu has CLAM which could do.
Fedora does not mention any specific antivirus products and no one here seems to be behind that OS so I'm counting it as out (it was the best looking from the screenshots which is why it was my first choice).

Here is a great question which will make my choice easier:
How do I view the programs available in the Repos for each of the Linux OS's with my Windows OS? I tried Google and kept reading "Install the OS and add the Repos." I'd like to know beforehand what's there. It's like buying a car and asking the seller if it has heated leather seats and the seller says "Buy it and find out." NO!