I'm not familiar with this board but the only driver I typically need to uninstall is the Audio before updating. Some software such as UPS also needs to be uninstalled. Could there be a problem with how you are updating? Try running the update directly (Start Menu > Programs > Accessories > Run prompt) instead of through Device Manager or vice versa. I don't know if directions are provided for LAN installation. Otherwise Control Panel > Programs > Uninstall a Program should work. If there is no connection (therefore unpowered) there should not be an automatic reinstallation of a default driver?