Hi makary,
Like ahongcp14 said, you can download 7-zip to help open zipped files.
Check out this website for further assistance with his issue:
http://customize.org/help/How_To_Unzip_A_File
If you need further assistance in your program, you can post your questions here on community, email tutor@ashworthcollege.edu or call the tutors at 1.800.224.7234.
~a.g