i dunno if many people know about this but this worm has been spreading since january 16th and on february 3rd as part of its program it will launch and decimate a large number of your files, while there is still time i suggest you back up your important files.
in case you don't believe me about this issue, the cnn has released a story about it.
h ereis the link, it also incudes a short video demonstrating what the worm will do to a pc.