Hi guys, hold your horses if you are thinking about reformatting, here are some help for The Address Is Not Valid problems!
-Go to Tools, Connections, and then LAN Settings, make sure the box for Proxy server is un-ticked, unless you are planning to use a proxy

(Btw, if you are, then at least make sure the proxy is working)!
-Restart your computer, some weird things do work wonders

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-Use the System Restore.
-Uninstalling security programs, if that doesn't help, then install it again.
-Get rid of programs.
P.S Get Firefox, much more reliable then IE for web-surfing. Don't uninstall IE though, I think you need that for programs that access the internet.