That was last year, when on average it would take 20 minutes for a fresh PC to be compromised, simply by being connected to the internet without the owner actually doing anything.
The biggest problem there is that it tends to take longer than that to even download & install the required servicepacks and hotfixes, so you are likely to have a major problem on your hands if you don't happen to have a firewall or the servicepacks etc. available on CD.
That is basically what I said, I totally agree. The biggest problem there is that it tends to take longer than that to even download & install the required servicepacks and hotfixes, so you are likely to have a major problem on your hands if you don't happen to have a firewall or the servicepacks etc. available on CD.