The Windows Patch—What You Need to Know :
"On Tuesday February 10th, Microsoft released three new security updates to patch new vulnerabilities, one of which is catching a lot of attention. Security Update MS04-007 is rated as critical because it has the potential to leave a user of Windows NT, 2000, XP or 2003 Server open to an attack that could result in remote code execution. The vulnerability has no workarounds, and is being very strongly recommended by Microsoft and security organizations. However, at this time, Microsoft says there are no reported incidents using the vulnerability, but is recommending the patch as a preemptive strike against attack.…"

http://www.pcmag.com/article2/0,4149,1525075,00.asp