no actually there was no offending app. I did what you said, disabled the startup apps, and then went one by one rebooting each time and shutting down again. The weird thing is , I disabled all the apps, and then finally got around to enabling all the apps since the computer was acting properly on each reboot and shutdown.
Now there is a NEW problem. I am trying to connect this wirelessly to a router, which already has another wired connection on it. The wired one connects easily but this one which is wireless detects the network, but it keeps saying 'acquiring ip address' but finally ends up saying 'limited or no connectivity' Why doesit do that and how to fix it? I have service pack 3 by the way.