Need help unzipping a file

I compressed a file containing jpegs a couple of years ago, now every time I try to unzip the file an error message pops up stating:
"Unable to unarchive "Vacations.zip" into "Desktop".
(Error 1 - Operation not permitted.)

I've also tried unzipping it by using Stuffit Expander and that doesn't work either. I get an error message stating:
"Stuffit Expander quit unexpectedly"

I'm running OSx 10.6.7
Any help solving this problem would be greatly appreciated!

 

The Unarchiver worked perfectly. Thanks MacDawg!