miffedmom,
Ok, i can assume you're using Windows XP? If you are, unzipping it doesn't really require Winzip.
Just browse to where you have the file "AMVConverter_4_mod.zip" stored on your computer and 'right click' on it with the mouse. In the pop up list you should see a few options.
One of those should be "Extract All..."
Choose that and a window should pop up with the words "Welcome to the Compressed (zipped) Folders Extraction Wizard".
Click "Next" and it should present you with a destination directory that you can change, just something like "C:\AMVConverter_4_mod".
Click "Next" and it should extract the files to that folder.
Then just use My computer to browse to that folder and double click on "amvtransform.exe" to start the program. Alternatively, you can right click on amvtransform.exe and choose to send a shortcut to the desktop so it's easy to find and start again later.
Hope that works