My suggestion; use PowerArchiver 6.1. It's better than PKZIP and freeware to boot. Don't bother with version 7, they messed it up.
BTW, does anyone else here remember reading of the death of the founder of PKWARE in the news a couple of years ago? It sounded like a trashier remake of "Leaving Las Vegas"
Power Archiver isn't freeware anymore. Used to be however.