Hi,
Thank you for contacting Microsoft Community.
From the issue description I understand that you are trying to downgrade to windows 7 pro and having issues in un-zip the driver folders.
First of all I would like to tell you that to downgrade Windows 8 to an earlier version of Windows depends both on the version of Windows 8 that you have and on the method by which you obtained Windows 8. Not all Windows editions provide downgrade rights. If you do have downgrade rights and decide to use them, you continue to keep the license and rights of use for your original version and may "upgrade" back at any time.
I would suggest you to refer :
https://support.microsoft.com/en-us/kb/2832566
About the drivers if there is a zipped file, you can un zip that file by following method:
Double-click the Zipped File
The easiest way to unzip a file is to double-click it. A window with the zipped files contents will open. You can click Extract all files or drag the files out of the window to the desired location (example: the desktop).
If you choose to click extract all files, the files will be extracted (unzipped) in the same location as the original file unless you specify a location in the Select a Destination and Extract Files box that appears when you choose to extract them.
Right-click the Zipped File
Right-click the zipped file and select Extract all. The Select a Destination and Extract Files window will open and let you choose if you want to save the files in the same location as the original zipped file or you can choose where you want to save the unzipped files by clicking browse and choosing a new location.
Compress and uncompress files (zip files)
http://windows.microsoft.com/en-us/windows/compress-uncompress-files-zip-files#1TC=windows-7
For can also refer to the suggestions given by Andre Da Costa replied on August 17, 2013in the mentioned thread:
Hope this helps.
Regards,
Anusha