So you've installed Windows 7, now you're unable to install the Motherboard drivers correct? you may be using old drivers, you will need Windows 7 compatible drivers.
You can download the latest version from here...
http://eu.computers.toshiba-europe.com/innovation/download_drivers_bios.jsp
Once you've downloaded the drivers you need, right click on the setup file and click Run As Administrator and install the drivers.