Unzipping

If you only need to open zips and have WinXP, there's no need for anything. It includes native support to open and create zips.
 
WINACE! Better compresion (which you didnt ask for :) ) and can zip/unzip more file types than the above.
 
A very good Open Source zip program
7zip http://www.7-zip.org/

The main features of 7-Zip:
  • High compression ratio in new 7z format with LZMA compression
  • 7-Zip is free software distributed under the GNU LGPL
  • Supported formats:
    • Packing / unpacking: 7z, ZIP, GZIP, BZIP2 and TAR
    • Unpacking only: RAR, CAB, ARJ, LZH, CHM, Z, CPIO, RPM and DEB
  • For ZIP and GZIP formats 7-Zip provides compression ratio that is 2-10 % better than ratio provided by PKZip and WinZip
  • Self-extracting capability for 7z format
  • Integration with Windows Shell
  • Powerful File Manager
  • Powerful command line version
  • Plugin for FAR Manager
  • Localizations for 60 languages
 
WinZip 8.1 if you can find it somewhere.

Windows XP has zip built in, but you don't get all of the extra formats like WinRAR.
 
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