Are you puzzled to see your IIS opening up blank not showing any of your sites? Is SharePoint server 2007 installed in the server? If yes, the issue is because of overloaded thread requests on your IIS. I suspect this has something to do with the WSS timer service. Not sure though. To get back your IIS just do an IISRESET in the box. And there you’ll get all your sites back in IIS.