assuming that program is not protected by only PeID checking is quite naive, there are too many possibilites not covered by it.

for example script messages can be encrypted

1. try to search your strings using hex editor. also, browsing file with hex editor can tell you whether the file is encrypted or packed (packed and unpacked bytestreams look different)
2. try to search them in unicode translation.
3. look in the resources String section.

and stop looking for "unpacker for visual c" there is no such thing