W32 Virus

I am a novice when It comes to computers.  Now, my laptop pops up "malice, worm W32" etc.  It shuts down.  What can I do to get it back online.  I have no security on it, I guess that was bad too.  But what can I do to get it back on track.  Again, new at this, please help!!!!  Don't know what to do!!!:womansad:

 

Thanks in advance for all your help and information.:smileyhappy: