Nuke and pave. Update to vista/w7 and do not disable user account control. It will notify you on any installs you might not be aware of. Watch your sons internet activity better and your own as well. Do not use the same email/pw for wow with anything else on the internets. Look through your history as well as the event logs in windows. Your favorite wow porn flash game from e-baums is prolly where your getting attacked from.

Fire up a VM and do your browsing from there.