I have read this and this this
But I have a few requirements that I don't know are addressed in those questions.
I am looking for a Replacement for our Symantec Anti virus. (if you want to know why see the end of this question. Here are the requirements for the AV software.
1) Must be Enterprise Wide 2) Must be able to control it from a server (kind of the same as enterprise wide) 3) Must not have to pay for updates (ie virus updates) 4) Window 7 x32 and x64 bit compatible 5) Windows 2000 x32 bit compatible (This is a sad requirement I know. If it cannot be filled then that is OK, it will just add another reason to get this very OLD OS out of our company.)
Background (if you care)
The main reason we are looking for a replacement is that the upgrade path form our current version would require our PC Support to remove any current versions of Symantec before upgrading to this new version. This is has been the main reason why they have never looked for a new virus software, because it would be too big of a hassle for PC Support to go around to each machine and remove Symantec to install something else. Symantec is a big resource hog and it would make a big impact on user machines if we could find something better.