It's not so much of a newbie issue. A program such as 7zip can open ZIP files, and all you do is extract it. Just open with 7zip and then press EXTRACT button, then extract it to where you want. It will put a new folder or no folders and put the files into it. Then, you use it. If it fails to load the file, I use another app, WinZip. It worked good so far.
Here's The LINK for trial : Download.cnet.com/WinZip/3000-2250_4-10003164.html.
Hey, one more thing. DO NOT UNINSTALL THE 7zip. It could be the file, or a malware attack. Beware for DORMANT MALWARE on Zip files! Bye now.