A critical bug affecting Media Player and Internet Explorer on Windows XP SP2, NT, 2000 and 2003/2003SP1 has been discovered
, one that could allow arbitrary code execution. It isn't as bad as some others as it appears to not be exploited in the fashion of common windows-targeting Internet worms, but has been rated as high due to its potential damage. Microsoft has officially stated they are aware of this problem and since details are not publically available, it isn't a great concern. Likely it will be patched with the next release of Windows updates as the last line didn't cover it. Just another good reason to keep Windows automatically updating, and to be careful when downloading content from untrusted or unusual sources.