I've encountered this problem as well.
1: Go to your control panel. (Start icon > Control panel.)
2: Find Programs and then Uninstall a program.
3: Scroll down until you've found WinZip and uninstall it.
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That should work, or so it did when I found it. Your computer automatically has its own installer in it (normally.); if it doesn't you'll have to install a completely different installer manual & installer. [Or I can help you.]
Hope this helps, sincerely, Re.~
Awwhh, you're welcome! Glad I could help; I know how annoying this problem is. c: Sincerely, Re.~