click here for what this program does. Looks like you need it to run your sound. I suggest you leave well alone unless you don't want your sound card to work.
So far as the virus issue is concerned, viruses that try to switch off av software have been around for some years - you get situations where AV can't see a virus although you know its there. This is why its essential to ensure your scanners are up-to-date. Some on-line processes need you to turn off your firewall, and this is always a risky process. The balance is between doing what you need and ensuring that nothing else goes on at the same time....and, of course, remembering to switch you firewall back immediately after you've finished - rebooting may not do this for you.