There are also other free and commercial (paid-for) apps for unzipping your content. Please note that Mac OSX and Windows 8 natively support unzipping files, so there is no need to install any new applications.
Copy the Zip file to the location on your hard drive you wish the Sample pack to be. On PC right click and use the Winzip Extract to here tab. On Mac Just Double Click the Zip file.
This way ensures all files and folder stuctures will be correct.