Empty folders on Mac

I recently bought a MacBook and I'm trying to share files with my PC. I can view the shared folders on the Mac but some of them are empty. Oddly, the Mac can see the .exe files but platform agnostic files (html, xml, etc.) don't show up. Any thoughts?

I think this is caused because the Mac can't gain admin access to the computer, and therefore can't access those files. Never tried to fix it though...