Niko Mak's WinZip is considered by new and experienced users alike to be the best compression utility available on the Internet. WinZip features built-in compression and decompression capabilities for ZIP, BinHex, MIME, UUencode, XXencode, Z, TAR, Unix compress, GZIP, and EXE (self-extracting archive) formats.
Quite simply, if you can download it off of the Internet, you can install it using WinZip. One of its best features is the ability to quickly and efficiently check out, or install, an archived (compressed) program and then uninstall it later if you decide you'd rather not keep it.