Remote Procedure Call

Using Windows XP Pro, when I’m online I get a popup box saying it’s going to shut the system down in 60 seconds. And it does. There’s a red shutdown button on the left side of the popup window and the normal ‘X’in the upper right corner, but neither one are functional.
My question is, what’s causeing the RPC box:
http://wombat.doc.ic.ac.uk/foldoc/foldoc.cgi?query=RPC&action=Search
box to popup and what do I do to stop this from happening?
Thank you for your time and trouble.