Fata error when installing PEAR

Below please see my attempt to install PEAR on my WIn2k. I have no idea how to proceed. I really would appreciate help. 1-7, 'all' or Enter to continue: The following PEAR packages are bundled with PHP: DB, Net_Socket, Net_SMTP, Mail, XML_Parser, PHPUnit. Would you like to install these as well? [Y/n] : Loading zlib: ok Downloading package: PEAR.............ok Downloading package: Archive_Tar......ok Downloading package: Console_Getopt....ok Downloading package: XML_RPC..........ok Bootstrapping: PEAR...................(remote) ok Bootstrapping: Archive_Tar............(remote) ok Bootstrapping: Console_Getopt.........(remote) ok Downloading package: DB...............ok Downloading package: Net_Socket.......ok Downloading package: Net_SMTP.........ok Downloading package: Mail.............ok Downloading package: XML_Parser.......ok Downloading package: PHPUnit..........ok Extracting installer.................. Warning: main(PEAR.php): failed to open stream: No such file or directory in C:\Archive\Tar.php on line 21 Fatal error: main(): Failed opening required 'PEAR.php' (include_path='/C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\gop7.tmp') in C:\Archive\Tar.php on line 21 C:\>