Not sure what you are running so here are some free downloads.
File Decompressors /Compressors
WinRAR is a 32-bit Windows version of RAR Archiver, an archiver and archive manager. RAR files can usually compress content 8 percent to 15 percent more than ZIP files. WinRAR's main features include strong general and multimedia compression, the ability to process non-RAR archive formats, ZIP compression and decompression, long filename support, programmable self-extracting archives (SFX), damaged archive repair, authenticity verification, embedded file comments, and encryption. Unicode is supported in archive filenames, allowing non-English filenames to be handled painlessly.
You can manipulate the parameters of many archives at once and view a volume sequence as a single archive. WinRAR is able to convert other archive formats to RAR. It supports the Find command, allowing search for specified text and files in archives. The latest WinRAR version can rename files inside of RAR archives and preserves file time using the high precision NTFS time format.
http://www.rarlabs.com/download.htm
7 Zip
http://www.7-zip.org/
7-Zip is a file archiver with high compression ratio.
7-Zip is free software distributed under the GNU LGPL.
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, ISO, ARJ, LZH, CHM, Z, CPIO, RPM, DEB and NSIS
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 63 languages
http://www.paehl.de/english.php
Simplyzip is a FREEWARE multi archiver. It does not write any entries to the registry or anywhere else. Version 1.1 has been rewritten from scratch.
Main Features:
Open: ZIP, CZIP, ACE, CAB, RAR, TAR, GZIP, LZH, BZ2, SQX, RS, UUE, XXE, BASE64, UCL, ARJ, ZLIB, ALIB, RPM, DEB, 7-ZIP
Create: 7z, ZIP, CZIP, Cab, LHA, TAR, TAR GZ TAR BZ2, ACE (optionale DLL), Deepfreezer, SQX, UCL, RS, ZIP-SFX/LHA-SFX, RAR-SFX, UUE/XXE, ZLIB and Base64.
Multi-ZIP
Backup to disk (e.g. CD)
ZIP-Rpair
Crypt files with:Rijndael AES/Twofish (both 256bit keysize) and Blowfish (448bit keysize) incl SFX creator and an ArcConverter
Optional: See ArcConvert below
Create RAR/ACE (new version) and LHA SFX (with optional files from my site)
Localisation: English, German, Italian, Spanish, portugues-br, Swedish and Thai
ZIPSFX now in English, German, French and Spanish (in the setup)
Standalone: After installation you can copy all files from Simplyzip folder (excepted the uninst.exe) and use it whereever you want
Optional Plugins (ArcConvert, ACE DLL, LFB Archiver, Unpacker and a short german manual)