How come Windows Update, HP assistant, and Internet Explorer have stopped working?

by on June 30, 2009

Q: I have an HP Pavillion dv9000 laptop with Vista installed. I’ve been getting pop-ups that Windows Automatic Updates has stopped working, then the HP assistant (a toolbar type of thing on the desktop) stopped working, then the CaTrayLauncher stopped, and now Internet Explorer takes several attempts before it finally opens.

My Norton360 says everything is fine. What do you think is causing it? What can I do if it is a virus? I don’t use Vongo, can I delete it and the tray thing?