Right Click your top folder and select “Send To… -> Compressed (zipped) Folder.”
You will now have a compressed folder with a .zip extension that is very useful for e-mailing, backing up, or just saving space.
NOTE: You may get a message from Windows asking you if you want to designate Compressed (zipped) Folders to handle all .zip files. If you do, simply select “Yes”.
To open a .zip folder just double click it with the left mouse button. It acts just like a normal windows folder.