One of the views that disappeared was the view associated with Unauthorized Administrators.
We never edited that view, but it wasn't one of the view that disappeared.
The reports we were trying to make were:
An edit to the PCs with less than 512Mb ram
A new report listing PCs with Symantec A/V installed.
I wish I could give you more detailed info on the process we went through. We're really not sure what we touched to make a few views completely disappear.