Jupiter, there's a page about that very error here:
Error 1327 Invalid Drive
Try the solutions that are listed there and see if they work for you.
canuck... I'm not sure what's going on there. If ipconfig isn't spitting out an IP address, then that PC doesn't have one. It could be that the router you're using to share your Internet configuration has become misconfigured. Without being there in person, it's a little hard to diagnose.