Ok, especially for lazuro:
Creating a ZIP file is very easy. First you need a program which will do the work.
Most known programs are WinZIP and WinRAR. I usually prefer the later. Here is the link
http://www.rarlab.com/rar/wrar341.exe . It is Shareware and the link is for a trial version. But usually it will work even after the 40 days they offer you as the trial period.
Simply install it with the default settings.
Now use your Windows Explorer and go to the directory where your files are. Then select all the files you want to add to the archive. You can select files by holding the Ctrl key on your keyboard and click on every file that should be selected. Or select the first file in the list and then hold the Shift key and select the last file, all files in between them both will also be selected. Or simply press Ctrl and A to select all files in this directory.
When done, do a Right click with your mouse on any of the selected files. It will offer you the context menu which also has items from WinRAR.