It's not that bad for all PCs. For instance, mine sits behind a hardware firewall, I use software to filter out all ads and pop-ups, I have anti-virus software running constantly (it can be over-sensitive, but best to be safe), I run Adaware every so often and watch which websites I visit. Oh, and I only use Opera for surfing - IE is confined to Windows Update.
Hmmm, that's still quite a lot. With a little effort and common sense, it's not hard to avoid spyware and viruses. Unfortunately many PC users don't seem to be that wise.
How can anyone have 122 viruses and 200 spyware files? Does he surf porn all day?