have not paid for it you have violated the license and essentially stolen the use of the program. In the directory that you have installed WinZip you will find a text file named License.txt and it rather clearly states the terms of the license to use WinZip.
Please read the license terms below. If you do not agree to all
of the terms of this License, then do not use, install, copy,
distribute, or transmit WinZip.
SCOPE OF LICENSE
This is not free software. Subject to the terms below, you are
hereby licensed by WinZip Computing, Inc. ("WCI") to use one copy
of WinZip, on one (1) computer or workstation, for evaluation
purposes without charge for a period of 21 days. If you use this
software after the 21-day evaluation period, a license fee of $29
is required. Payments must be in U.S. dollars drawn on a U.S.
bank, and should be sent to WinZip Computing, Inc., P.O. Box 540,
Mansfield, CT 06268, USA. Use of WinZip after the 21-day
evaluation period without payment of the license fee is a breach
of this License and a violation of U.S. and international
We know you most likely didn't intend to pirate the software, but you should really either immediately go to the Winzip web site and pay for what you are using or uninstall it and install a completely free utility for the job such as ZipGenius - http://www.zipgenius.com/ or CamZip - http://www.camunzip.com/ or SimplyZip - http://www.simplyzip.com/ or one of the others suggested (all of which actually are freeware).