"file-format module cannot parse the file"

I have been saving .psd files out as .png files, but when I try to reopen the .png, I get a message that reads "could not open because the file-format module cannot parse the file.

Have you got any Norton program on your computer; or are you using Entourage?

I don't think I have either

Make sure that you have a "PNG.plugin" in:
Plug-ins/Adobe Photoshop Only/File Formats/PNG.plugin.

You may also need to trash your Photoshop Prefs. and Repair Permissions.

That seem to work...thanks for the help