http://www.deanliou.com/WinRG/
Not what you were talking about, but still fun
"File Windows.dll was found, so Windows has deleted it"
[...]
"File explorer.exe could not be deleted, the file is in use by Windows"
"Cannot find anything. Please reinstall Windows"
"Cannot find register.exe. Windows won't bother searching"
"Paint.exe has performed an illegal operation for no reason"
My personal fav.:
"Files downloaded. Please wait a second while we waste your time"