download winzip if you dont already have it
www.winzip.com Once you have that, right click on the file you wish to zip then -Send To - Compressed Zip file. This will thenzip the file for you and itspretty much as simple as that.
To take a screenshot of say your desktop, press the Print Screen button which is usally situated above the delete keys. Then go to Paint, or any other program (Word) and then go edit - paste and you will have the screenshot.