Another thing is when you right click on a file, there should be an "Open With" option that you can pick and then select the program you want to open it with.

Right now it sounds like the machine has had .zip associated with Notepad, which is very weird, as even on a newly loaded machine, zip files have no association until you associate a program with them or install one.

If the open with option doesn't show up when you right click on the file, try holding down shift while you right click.

A+ Certified PC Tech Guy/Seitentaisei