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Here is how to use 7Zip to unzip files:

1Go to a site that has a program that can open 7Z(or compressed files). An example is 7Zip (see Resources).
2Click on the "Download" link and then click "Save File" when the download screen comes up.
3Find the installation file after it finishes downloading. It should be in your desktop or "My Downloads" folder. Double-click on the file to begin installation, which will include choosing a directory for your program.
4Find your 7Z file and right-click on it after installation is finished.
5Select "Open With" and find your archive-opening program, and click on that. The program should now begin to open your 7Z archive.

Here’s to Good Karma

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Unable opening zip files denotes file corruption

In this case you need to programmed method to recover zip archives http://www.zip.repairtoolbox.com