Two things I need help on. Anyone know why IE would take you to a site called: http://www.internet-optimizer.com/Help/NavigationError/

everytime it has a bit of a problem? This is not on my computer. My mother's computer does this. I suspect some one clicked on one of those pop up ads that says "Your Inrter net connection is not optimized do you want to do it now?" and they clicked on it. Apparently the internet connection now runs to this site everytime there is a problem. She has windows ME. It may also be running everything through this site as the whole system operates very slowly. How do I undo this?

Second question:

Anyone know how to lock a hard drive so new programs cannot be installed by anyone other than the authroized user running windows ME???? My nephew has a bad habit of visitng tastless sites that he shouldn't be and installing things that are porn related on a computer that is not his. My mother is not computer savy, so she never sees that they have been in stalled. Any way to prevent the creation of ne dial up adapters? He sets up his own to by pass her password.