windows xp administrator account

Help.
I am using windows xp home. I have ntl broadband using ethernet connection.
i tried to change to usb but it was too slow so went back to ethernet. however now my administrator account has been affected and is very very slow and my system restore has disappeared. Yet the user account (not the admin account) seems to be fine.
Any clues as to why and what i do to fix the problem

  remind 10:53 23 May 06

if you installed usb drivers for the modem, remove them
look at your process list with task manager and see which is using the highest % of cpu time

never choose usb over ethernet for b/band :)

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