I tured on my pc today,which is connected to a stardard router with the usual SPI firewalls and NAT, and is always on broadband. I opened a word document and then the Windows NT/Authority RPC box came on and it proceeded to shutdown my pc after the 60 second countdown. This is exactly like what all those worms caused a while ago , but i dont see how it infected me. I have no software firewall running and i havent for 2 years or so and ive been fine. My pc runs winxp pro sp2, ive checked the other pc' s on my network and they work fine(they run winxp home sp2) . I have update date av,antispyware, and the windows updates. Im wondering what fix can i run to get rid of this and what do i potentially need to do to prevent getting infected again.