Is there a need for anti-virus software?

[bigdaddylddd]

Or in my instance:

The two clubs I play at have wireless internet. I plan on using Hoster for my karaoke, and run iTunes (connecting to the internet to purchase songs for DJ'ing and requests). If a customer requests a song I could download it in minutes and play it and add it to my DJ library.

I would like to have Firewall, Virus protection, & Adware/Spyware protection on my Hoster/DJ machine. Will this extra 'baggage' bog Hoster down?

I would not feel safe having an unprotected PC connected to the Internet these days.

As far as a customer giving you a 'homemade' disc, who knows what could be on it? Could be an easy way to sabatoge someones show.