Yes, I know I harp on this regularly, but it's worth doing. :P This is a reminder to everyone to practice safe internetting where possible. We're part of an online organisation, in which hundreds upon hundreds of files change hands every day. It makes the club a lot more fun for everyone involved if you take responsibility for keeping your system clean of viruses. If you don't have a virus scanner, I highly recommend buying one - they only cost £30 (approx $45US) for a year, and they can save you a lot of trouble at the end of the day. If you have a virus scanner, make sure you keep it regularly updated. If you're running Windows, make sure you download critical updates regularly, disable file sharing (where possible), and remember the golden rules of email attachments:

1: Don't open an attachment if you don't know who it's from
2: Don't open an attachment you weren't/aren't expecting

Stay safe!