When playing the Winamp, Windows Media player I'm getting an message We are sorry for the inconvenience. You are using a pirated(illegal) version of Microsoft. Some Applications could not be launced. After this message the Application closes.

Even I'm using the Original Windows XP. Anyone can help me?

Hi,,

This happens because your computer is affected by the W32.Launcer.A worm/virus.
There is nothing to worry and it is not the serious issue and Microsoft has nothing to do with it. This can be easily resolved. See the below symantec link and follow the steps as mentioned in it.

http://www.symantec.com/security_response/writeup.jsp?docid=2008-032912-0913-99&tabid=1