The current virus going around, Sven exploits a really old flaw that was found 2 years ago. Its disguised in an email as a secuirty update. Its not.
As for there being a new Windows Virus? Yes, several. There are a few released each day, but many will only affect a small portion of the computing population. With so many being released its very easy to see why Symantec can have so many employees who work full time just to find these new viruses and have them in their latest virus definitions. Its quite the industry.