I suspect two things:
first that you have a dynamic IP address (the address you've posted from is not the same as the address that you're written in your post).
and your address has changed. so you're actually connecting to a fileserver being run by someone else.
Or, the configuration (specifically home directory) on IIS has changed.
or you were connecting with the tsweb (Terminal services web) client, and this is on a port other than port 80 and you're not putting in the port number
Remote Desktop Web Connection
(is that what you;re looking for?