Since the MyDoom attack, I’ve gotten into the habit of updating my anti-virus software almost daily. What’s scary is that new updates have been available that often, meaning that new viruses are appearing that frequently (many of them variants on MyDoom). I can’t say it enough: UPDATE YOUR ANTI-VIRUS SOFTWARE. If it’s too old to catch the current bugs, it’s no use to you.
You may also have noted that there’s a new security hole in Windows discovered just about every week. Hackers may have even more opportunities to exploit Windows vulnerabilities, now that several million lines of Windows source code have been leaked, so be prepared for an increase in attacks. It doesn’t hurt to run Windows Update weekly, at least, to see if Uncle Bill has any new patches for his leaky boat.