Read this...
For the third time in the last 90 days, Microsoft Corp. has warned that hackers are exploiting an unpatched critical vulnerability in its software. Late Thursday, Microsoft issued a security advisory that said malicious hackers were already using attack code that leveraged a bug in DirectX, a Windows subsystem crucial to games and used when streaming video from Web sites.
..........(for more check out the article)
http://www.computerworld.com/s/artic...ed_Windows_bug