I have Vista Business running on my laptop. During the course of the day, I suddenly am unable to browse the internet. IE reports that the destination is unreachable. I can however ping the server from the command prompt. My network drives are also not accessible. I can still get new email in Outlook (we are using a Exchange). If, however, I close outlook and try to reconnect to email, it fails. If I reboot the computer, everything works fine again. It's very strange.