I have just re-installed windows xp on my toshiba notebook computer. I have just checked my system properties and see yellow question marks next to the ethernet controller and network contollers. How do I fix this?? so I can hook it up to my modem router and get on the internet ??

Do you have a driver CD from Toshiba?

If not have you tried to load the drivers that might be offered in the Device Manager?

Start/Run/ devmgmt.msc

Otherwise can you ID these devices? You should be able to find drivers on-line.