That's odd - if intellisense is telling you that there's no information available, that suggests its not been disabled (I'm not even sure if you can disable it anyway) I'd suspect either a bug in MSVC++, or something has gone wrong with intellisense's lookup (maybe its database has gotten corrupted somehow?)
Sometimes in MSVC++ 2003 it gets confused by template template types (Especially if you manage to make a typo), and that can cause it to stop working, but usually only temporarily.
Maybe it would be worth creating a whole new Win32 Console project, just in case something 'weird' has happened to your current one. Try writing a 'hello world' app or something simple just to see if it works in there.