12 minutes to PC infection

Yes. That's all it takes for your PC to get infected if it is not properly secured according to a major security company as per this article.
Almost 8000 new viruses have been detected in the first half of 2005 which is a 59 percent increase over the same span last year.
I can clearly notice that myself. Lately I have been getting a lot of inbound attacks on my PC. Thanks to Zone Alarm, my PC is still up and running. touchwood :)

12 minutes to PC infection