Are you really sure you were running 7.5.5 prior to this?
The path you list tells me your board was running UBB Classic. As in "cgi-bin".
What do you mean by the OS being Vista? Does that mean that the "server" hosting the forum is running Vista? If so... Way bad idea. But that is kind of beside the point.
Did you take any notes about what you did?
Looks like a job for Gizmo Man.
