Microsoft released another critical update today. Here's the link to their article:
http://www.microsoft.com/security/se...s/ms03-039.asp
Could be another one as bad as the RPC vulnerability, but it's too early to tell.
Make sure your machines are patched
According to their web site, they say very generically
A security issue has been identified that could allow an attacker to remotely compromise a computer running Microsoft® Windows® and gain complete control over it. You can help protect your computer by installing this update from Microsoft.