I'm about to open a dedicated server for a game called Minecraft. The server is running Windows Server 2008 R2. The problem is, I don't know whether or not I should install an antivirus on it. No one will have access to it besides me and I won't be downloading anything on it, nor will there be any file transfers. Is an antivirus still required?
If your server is facing the internet and people can access it (to play the game), it means that 1 or more ports are open; it is therefore accessible to the outside world and 'open' to attack.
Ensure you have a good firewall and I would still recommend an AV!
I have used ClamAV and it worked fine (and it is free) - I used it to monitor my all in one mail/web server. As it's free though don't expect the world (although you can pay for it for more features). It may be worth while starting with a free AV and seeing how you go, although my money would go straight on Kaspersky from the word go!