I myself use winrar - you can download it at Download.com. Its just more than 1MB in
size.
Once you unzipped it, you can compress it again to zip format. Or you can download WinZIP 11 at Download.com as well. About 7.3mb. Be
carefull though, some of these new updated versions are extremely commercialized - once installed they'll keep on
pestering you to activate this or register for that. The earlier versions are best, I suppose. I use WinRAR 360 and
WinZIP 10. Very little, if any, adverts.
If it is images you want to view or compress, then you can view RAR files' image contents with CDisplay (2MB). All it boils down to is changing the .RAR
extension to .CBR - but only if you want to. Other people might recommend something else.
Hope you manage!