Need drivers for Base System Device after Windows 7 install

I've done a clean install of Windows 7 on my dell xps 1530 and everything works fine, except two items in Device Mgr: BaseSystem Device. I've tried to update / uninstall / update drivers but not found. I figured, let me go to the manufacturer (Dell) and ask them for it, but I can't find any link on their website to tech chat so I can get them. Does anyone know where or how I can get these drivers?