Ok, if you get an email via Yahoo! Mail and the subject line is
New Graphic Site
then don't open it. Symantec has a good writeup of it: writeup at Symantec's site
Bigger picture: update your antivirus software, because they probably aren't going to stick with one subject line to tip you off to avoid it. If you have old feeble antique antivirus software from years gone by, replace it with some current stuff. AntiVir is a good one that's free for home users, if you need something on the cheap. Make sure to fully configure it, don't just install it and then leave it in Nerf mode.
Also, tomorrow is Patch Tuesday for Microsoft. There will be some new security patches ready around 11AM Pacific Standard Time; you can get them at (surprise) the Microsoft Update site.