Forgive me if this comes across as a dumb question (as I've mentioned before, I'm new to Mac), but do any of you use an anti-virus programme or do you (personally) feel that using a Mac is sufficient enough? If you do use an anti-virus programme, what is a good affordable one to use for the Mac? I want to download a file-sharing programme, but I'm afraid to do so until I get an anti-virus programme installed, and so this is why I ask. Thanks for the help, advice, stories, etc. in advance! Cheers!