Don, if your screen gets taken over by a popup again, just hit Ctrl-Alt-Del (simultaneously, though it often works better if you hold down Ctrl and Alt and then hit Del). This won't automatically reboot your computer like in the old days, but will bring up the "Close Program" dialog box. The program that's highlighted should be the name of the pesky window followed by your browser. Click on "end task", wait a minute, and another box should come up asking you if you mean it. Hit "end task" again and all the open windows in your browser will close, but everything else should be OK. At least, that's the way it works on Win98...not sure about the later ones. You can usually use this to close any program that's frozen.

Aloha,
Mark