I had a similar problem last week and could not connect to my ISP - Pipex - nor get e mail via Outlook Express. I spoke to a local expert, and he said (don't know how true this is) that sometimes am ISP is so busy they "run out" of ISP addresses. He reccomended turning off my modem/router for 5 minutes then it should acquire an IP address on restart. This worked! Maybe others more knowlegable will comment.