I'm no virus expert, but I would do a system scan first. If no virus is found, I would back up all of my important data, email addresses, favorites, etc and reload the thing.

Hello! Are you sure your ISP is working okay? If you happen to be using cable connection, there`s been lots of problems since @Home (the parent co.) went down last Fall. The local cable co`s had to redo their connections. For a mon. sometimes I would get a connection, sometimes I wouldn`t, it was becuase of the cable ISP. I then ended up switching over to DSL with Bell and have had no problems connecting since then.