Kerry, I fear you've got a bigger problem than "ordinary" spam. I don't know a lot about such things (because I've always worked in the luxurious environment of a Macintosh), but I have the impression that your machine is infected by so-called spyware. I'm sure that lots of RootsChatters with PCs and Windows will rush in to give you advice. Maybe you should start another thread on this problem because, as I say, it's worse than mere spam, and it's a rather nasty phenomenon. Recently, a friend of mine started to get email that seemed to be coming from my son, but they don't know one another. I believe that I was, unwittingly, the common denominator between these two individuals, not because I actually sent them the infection (unthinkable, coming from a Macintosh), but because the virus thing was able to establish links through emails that both individuals received from me.
Best of luck,
William